oscillate

1. V-I If an object oscillates, it moves repeatedly from one position to another and back again, or keeps getting bigger and smaller. 摆动[正式]

I checked to see if the needle indicating volume was oscillating. 我查看了那根音量指针是否在摆动。

2. oscillationN-VAR

Some oscillation of the fuselage had been noticed on early flights. 在之前的几次飞行中，就察觉到了机身有些摇晃。

3. V-I If the level or value of something oscillates, it keeps going up and down. (水平或价值)浮动[正式] [no passive]

Oil markets oscillated on the day's reports from Geneva. 石油市场因当日来自日内瓦的报道而出现了起伏。

...an oscillating signal of microwave frequency. ...一个微波炉频率的波动信号。

4. oscillationN-VAR

There have always been slight oscillations in world temperature. 全球气温一直在轻微地波动。

5. V-I If you oscillate between two moods, attitudes, or types of behaviour, you keep changing from one to the other and back again. (在两种情绪、态度或行为类型间)举棋不定[正式] [no passive]

The president of the republic oscillated between a certain audacity and a prudent realism. 该共和国总统施政时而大胆，时而谨慎务实。

6. oscillationN-UNCOUNT

...that perpetual oscillation between despair and distracted joy. ...在绝望和心不在焉的快乐间永无休止的徘徊。