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TOEFL BNC: 1316 COCA: 1444
activeadjectiveuk/ˈæk.tɪv/ us/ˈæk.tɪv/

active adjective BUSY

B1 busy with a particular activity忙于…的

physically/mentally active经常运动的／思想活跃的
You have to try to keep active as you grow older.年岁大了，应该尽量保持身心活跃。

More examples

It's good for old people to stay active if they can.

I had an active social life when I was at college.

At 84 he's still quite active, although he walks with the aid of a stick.

It was a very active day on the stock market today.

active adjective INVOLVED

B2 involved in a particular activity参与…的

Enemy forces remain active in the mountainous areas around the city.敌军在城市周围的山区仍然活动猖獗。
She's very active in (= involved in) local politics.她积极参与当地的政治活动。
Both of his parents were very politically active.他的父母在政治上都很积极。
It is important to educate children before they become sexually active.在孩子们进入性活跃期之前对他们进行有关教育很重要。
He takes a more active role in the team nowadays.现在他在队里发挥着更为积极的作用。
She's an active member of her trade union (= not only belongs to it, but does work to help it).她是工会中的活跃分子。

More examples

They both play an active part in their local church.

active adjective VOLCANO

C1 An active volcano is one that might erupt (= throw out hot liquid rock or other matter) at any time.（火山）活的，处于活跃期的

active adjective GRAMMAR

B1 language An active verb or sentence is one in which the subject is the person or thing that performs the stated action.主动语态的

"Catrin told me" is an active sentence, and "I was told by Catrin" is passive.Catrin told me 是主动句，而 I was told by Catrin 是被动句。
Compare
passive adjective

More examples

When you use active verbs in your written work, rather than passive ones, it sounds clearer and more direct.

Active sentences, such as 'The dog chased the cat', are more concise than passive sentences like 'The cat was chased by the dog'.

Speech-writers should use active verbs for a strong, direct style.

The sentence 'Oranges contain Vitamin C' uses an active verb.

In the sentence 'A thief stole my wallet', the verb is active and in the past simple tense.

activenoun [ S ]uk/ˈæk.tɪv/ us/ˈæk.tɪv/
the active

→ the active voice 主动语态（同 the active voice）

TOEFL BNC: 1316 COCA: 1444
active

adjective

VERBS | ADVERB | PREPOSITION VERBS➤be活躍▸➤become變得活躍▸➤keep (sb), remain, stay（使某人）保持／仍然／依然活躍◇Try to keep active in the cold weather.天冷時要盡量多活動。ADVERB➤extremely, fairly, very, etc.極其／相當／非常活躍▸➤highly十分活躍◇a highly active volcano十分活躍的火山➤increasingly越來越活躍▸➤mentally, physically思維／身手敏捷◇It's important to remain mentally active after retirement.退休後保持敏捷的思維是十分重要的。➤sexually定期有性行為的◇By the age of 18, 65% of teenagers report being sexually active.65% 的青少年報稱 18 歲之前已定期有性行為。➤economically, politically經濟上活躍的；政治上積極的◇When did you first become politically active?你是什麼時候開始投身政治的？PREPOSITION➤against對⋯起作用◇drugs that are active against cancers對治療癌症有效的藥物➤in在⋯方面表現積極◇She has been active in local politics for some years.她數年來一直活躍於當地政壇。
TOEFL BNC: 1316 COCA: 1444
active adj.
⇨ active (the active ingredient in aspirin) ⇨ busy 1 (active in politics) ⇨ energetic (physically active) active

adjective

active ♦︎ in operation ♦︎ in force ♦︎ in action ♦︎ up and running ♦︎ operationalThese words all describe sb/sth being able to do, or doing, the activity or work that is typical for them. 这些词均表示发挥功效或起作用。■ active doing sth regularly; functioning; having or causing a chemical effect 定期进行的；起作用的；起化学作用的◆These animals are active only at night.这些动物只在夜间活动。◆Numbers of sexually active teenagers have continued to rise.有性行为的青少年人数持续增加。◆The virus is still active in the blood.病毒仍然在血液中起作用。◆What is the active ingredient in aspirin?阿司匹林中的有效成分是什么？ OPP inactive ⓘ Inactive describes sb/sth that is not doing anything, is not in use or not working or has no effect. * inactive指不活动的、不使用的、不起作用的◆Some animals are inactive during the daytime.有些动物白天不活动。◆an inactive drug / disease失效的药物；非活动性疾病 ■ in opeˈration

idiom

 (rather formal) (of a system) working, being used or having an effect （系统）工作中，使用中，有效◆The system needs to be in operation for six months before it can be assessed.此系统须运行六个月后才能对它进行评估。◆Temporary traffic controls are in operation on New Road.“新路”正实施临时交通管制。ⓘ When a system comes into operation it starts working or having an effect. * come into operation表示开始运行或开始生效◆The new rules come into operation from next week.新规定下周开始生效。When you put sth into operation you start using it or make it start working. * put sth into operation表示开始使用或启动◆It's time to put our plan into operation.该是执行我们计划的时候了。   see also operate ⇨ organize , operate ⇨ work verb 3 ■ in ˈforce

idiom

(of a law or rule) being used （法律或规定）有效力，实施中◆The new regulations are now in force.新规定现已生效。ⓘ When a law or rule comes/enters into force it starts being used. * come/enter into force表示法律或规定开始实施◆When do the new regulations come into force?新规定何时开始执行？When you bring sth into force you make a law or rule start being used. * bring sth into force表示使法律或规定开始生效◆They are hoping to bring the new legislation into force by the end of the year.他们希望在年底前实施新法。 ■ in ˈaction

idiom

(of a person or thing) doing the activity or work that is typical for them （人或物）在活动中，运转中◆I've yet to see all the players in action.我还得看所有参赛者实地比赛。■ ˌup and ˈrunning

idiom

(of a system, for example a computer system) working; being used （系统，如计算机系统）在运转，在使用中◆By that time the new system should be up and running.到那时，新系统应该已经运转起来了。ⓘ Up and running is usually used to talk about sth starting to work or be used after a period of development. * up and running通常指经过一段时间的研发后开始运转或使用。   see also run ⇨ work verb 3 ■ operational [not usually before noun] (rather formal) ready to be used; in use 可使用；在使用中◆The new airport should be fully operational by the end of the year.新机场应该会在年底前全面投入运营。ⓘ Operational is very often used in the phrase fully operational. * operational经常用于短语fully operational中。   see also operate ⇨ work verb 3
TOEFL BNC: 1316 COCA: 1444
active
Energetic and lively: energetic, lively, active...
Busy and working: busy, active, tied up...
Busy places and times and describing busy places and times: madhouse, a hive of activity, the centre of activity/things...
Involved in something: concerned, active, involved...
Existing, happening or being dealt with now: existing, present, immediate...
Electricity and electrical power: AC, active, alternating current...
Volcanos: active, crater, dormant...
Describing chemicals and chemical processes: active, aerobic, alkaline...
Describing types and forms of verbs: active, causative, ditransitive...

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