1. crack a smile 展颜微笑，莞尔一笑
The man was willing to do anything to make his wife crack a smile.
为了让他的妻子展颜微笑，他愿意做任何事情。
2. laugh a hearty laugh/laugh heartily 放声大笑，开怀大笑
Upon hearing that he had won the lottery, the man laughed heartily.
知道自己中奖了，这个男人开怀大笑。
3. force a smile 强作欢颜
At the funeral, he forced a smile for anyone who offered condolences.
在葬礼上，他强颜欢笑面对前来吊唁的人。
4. saccharine smile 谄笑，谄媚的笑
When he talks to his boss, he puts on a saccharine smile.
他跟老板说话的时候，满脸都是谄媚的假笑。
5. smile bitterly 苦笑
The student smiled bitterly when his teacher caught him copying his homework.
抄作业被老师抓到后，这个学生满脸苦笑。
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