1. 回想过去：think out 想出,解决了,想清楚 | think back to 回想过去 | think well of 高度评价

2. 回忆起：think away想开了;想得忘了 | think back to回忆起 | think twice再三考虑,踌躇

3. 回想：that is to say也就是说,换言之 | think back to 回想 | give thought to 考虑

4. 回想,回忆：shy away from (由于羞怯/恐惧)躲开/退缩 | think back to 回想,回忆 | think better of 经过考虑对...改变主意