B1 to raise your hand and move it from side to side as a way of greeting someone, telling someone to do something, or adding emphasis to an expression挥(手);招手,摆手(表示问候、指示或强调)
to make a movement with your hand that tells someone to move in a particular direction挥手示意(某人)离开/继续向前(等等)
More examples
He would always turn and wave at the end of the street.
They waved at us as we drove by.
Mary waved at the man but he didn't seem to notice.
She suddenly espied someone waving at her from the window.
I wished her a safe journey and waved her off.
C1 to move from side to side, or to make something move like this while holding it in the hand挥舞,挥动;摆动,摇晃
If hair waves, it curls slightly.(头发的)卷曲,波浪卷
B1 a raised line of water that moves across the surface of an area of water, especially the sea(尤指海上的)浪,波浪,波涛
More examples
A large wave swept away half the sandcastle.
The boat was swamped by an enormous wave.
Wind and wave power are now being seriously canvassed as the solution to our energy problems.
A huge wave capsized the yacht.
The murmur of the waves on the beach lulled me to sleep.
C2 the action of raising your hand and moving it from side to side as a way of greeting someone, etc.挥手道别
US UK Mexican wave a wave-like movement made by a crowd watching a sports game, when everyone stands and lifts up their arms and then sits down again one after another人浪(指体育比赛中观众依次举起手臂站起复坐下,如波浪一般)
B2 the pattern in which some types of energy, such as sound, light, and heat, are spread or carried波,周波;振动
More examples
The microphone converts acoustic waves to electrical signals for transmission.
The unit emits an electromagnetic wave.
Radio Seven transmits on 201 medium wave.
Waves of light and sound are transmitted in every direction.
These sound waves travel at over 1000 feet per second.
C2 a larger than usual number of events of a similar, often bad, type, happening within the same period(常指坏事的)一波,一批,一阵
an activity that is happening again or is being repeated after a pause新的一波/第二波(等等)
More examples
The Met Office says that the heat wave will continue for most of the week.
The vineyard is representative of the new wave of wine producers.
Wave on wave of refugees has crossed the border to escape the fighting.
This recent wave of terrorism has ruled out any chance of peace talks.
A wave of strikes swept the country.
C2 A wave of an emotion or feeling is a sudden strong feeling that gets stronger as it spreads.(感情或情绪的)突发,高涨
a series of slight curves in a person's hair(头发的)卷曲,波浪卷
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