PHRASAL VERB 回忆;回想 If you think back, you make an effort to remember things that happened to you in the past. 回忆;回想
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I thought back to the time in 1975 when my son was desperately ill. [VERB PREP. prep.]
我回想起 1975 年，那时我儿子病得很重。
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When you think back on it, do you think that it was the right thing to do?. [VERB PREP. prep.]
现在回想起来，你觉得当时那样做对吗？
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Thinking back, I don't know how I had the courage. [VERB PREP.]
现在回想起来，我都搞不清我当时哪来的那股勇气。