1. 摆动；（大小）来回变化
If an object oscillates, it moves repeatedly from one position to another and back again, or keeps getting bigger and smaller.

1. move or swing from side to side regularly

e.g. the needle on the meter was oscillating

Synonym: vibrate

2. be undecided about something
waver between conflicting positions or courses of action

e.g. He oscillates between accepting the new position and retirement

Synonym: hovervibratevacillate