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- valuable 824
- anthill 114
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- Succeed 340
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- abbreviated 1336
- Cure 373
- recycling 172
- discordant 239
- addle 133
- shoddy 171
- trilogy 190
- velvet 479
- guzzle 184
- job centre 66
- bounds 107
- amperage 318
- landform 1086
- Print 260
- decathlon 203
- be worth it 41
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- nub 76
- incoherent 1043
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- border 714
- Means 174
- all-points bulletin 267
- generalized 361
- Postmortem 361
- affluent 1889
- burst 568
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- Horrifying 28
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- fairly 496
- nonentity 59
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- temporary 996
- lower 626
- wave 967
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- Vanity 63
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- Opposite 1631
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- cheer sb on 94
- multiracial 80
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- boxed 116
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- multiculturalism 79
- wife 791
- psych 84
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- ratio 619
- barman 190
- guitar 182
- beefsteak 159
- fleet 1290
- roofing 70
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- Nigh 221
- gentle 899
- oh 204
- scherzo 76
- spartan 72
- Avail 96
- keynote 213
- muhammad 55
- irritate 625
- spigot 83
- invitation 1604
- depict 197
- nosy 115
- hand-wringing 22
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- interrupt 2531
- swank 71
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- kampong 54
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- LEVY 71
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- signal 1004
- hankie 74
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- Micronesia 59
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- attempted 206
- dedicated 865
- slowly 564
- ram 446
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- Obliterate 401
- partition 495
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- bolt 1005
- follow-my-leader 128
- sacrilegious 65
- centre forward 255
- synesthesia 70
- Manager 431
- free will 231
- SUBMIT 44
- pressurise 140
- ignoble 131
- ardently 44
- aquatint 129
- voting 65
- anthropomorphism 174
- westerner 76
- greenpeace 164
- Shelter 605
- surf 116
- amplification 159
- District 1111
- arm 371
- energetically 45
- caricature 354
- immersive 490
- bleach 139
- above-mentioned 146
- Benefit 434
- godly 153
- Resemblance 966
- sophistication 285
- aromatherapy 211
- Treaty 189
- honky 75
- camp out 97
- concentrate 835
- corgi 221
- logbook 180
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- dumbfounded 980
- Greet 648
- hyperbole 93
- variety 577
- Trauma 204
- embittered 386
- Ton 363
- Understatement 104
- sexy 113
- backer 159
- pushy 124
- headland 68
- distinction 1452
- homograph 590
- crowdfunding 242
- striker 74
- reliable 1372
- desk 268
- duct 224
- poach 287
- Relaxed 68
- pretended 79
- paper girl 46
- Depict 266
- endearment 201
- airstrike 119
- stature 187
- Suspenseful 289
- driver 328
- inspector 300
- Valuable 933
- childminder 234
- Frozen 51
- tin 630
- disturbing 1683
- realism 111
- fungus 148
- intersection 810
- advisable 1488
- Alacrity 1296
- trampoline 987
- golden 494
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- standoffish 93
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- mineralogy 75
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- Feelings of confidence and pride 143
- farmyard 182
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- liberalize 730
- gratify 215
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- Attentive 161
- gasbag 144
- Antiquity 80
- Adage 110
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- unreadable 100
- comprehensive 1358
- motor car 64
- metaphysical 327
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- immediacy 425
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- motherfucker 295
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- Thrash 140
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- overstretched 101
- scintillating 146
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- ct 112
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- Priceless 1359
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- recognise 1135
- Ebony 142
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- Portal 164
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- Leg 113
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- messenger 1031
- Agency 311
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- manufacture 1706
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- indefinite 1871
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- Hug 195
- Unrest 209
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- hear from sb 188
- Hallo 51
- Attributable 11
- shopkeeper 1218
- feminist 247
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- resistance 1031
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- make up for 121
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- brightness 316
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- amnesia 189
- preach to the converted 49
- Branch 361
- Tertiary 309
- Stew 147
- Untrammelled 481
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- afford 593
- bath mat 107
- editor 581
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- permanency 56
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- Hence 332
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- mockery 173
- infamy 75
- gender 230
- dissolute 214
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- hole 518
- defeatist 410
- enrol 235
- Blessing 103
- unfortunately 831
- airdrop 122
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- gape 167
- Dangerous 663
- frenzied 179
- hold 370
- Ordeal 80
- prequel 66
- gingerbread 170
- home 430
- Harmony 250
- ax 619
- arrogate 441
- feed on 74
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- observance 1186
- strapping 444
- rake 517
- invite 643
- representation 652
- Chargeable 96
- 'cause 364
- big bucks 210
- dire 240
- saving 555
- sorry 291
- motocross 67
- harpsichord 187
- globalize 285
- do sb good 73
- parody 252
- lakeside 69
- worthwhile 1238
- treasury 366
- aqua 143
- Decommission 35
- underline 1234
- apocalyptic 297
- imperfect 176
- championship 609
- ticklish 59
- saddlery 112
- Nurture 91
- Seductive 42
- rubicund 68
- renewal 373
- towelette 84
- To die or to be killed 67
- corn on the cob 113
- rat 585
- bigoted 109
- pacesetter 68
- backing 218
- macroeconomics 208
- Counsellor 133
- Cargo 249
- bug 219
- storey 684
- midfielder 74
- squib 68
- nonetheless 567
- internationalize 66
B2 If something is optional, you can choose if you want to do it, pay it, buy it, etc.可选择的；非强制的
English is compulsory for all students, but art and music are optional.英语是所有学生的必修课，而艺术和音乐则是选修的。
More examples
Seat-belts are included as standard but electric windows are an optional extra.
My phone came with 20 optional ringtones.
Do come to the party - fancy dress is optional.
There are several optional tours, for which there will be a small charge.
The basic model is quite cheap, but there are a lot of optional extras.
adjective
optional adj.
⇨ voluntary 1
optional
Available and to be, or to become available: available, public, spare...
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