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。