※ crack a smile 莞尔一笑

The man is 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。

※ force a smile 强颜欢笑

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。

※ 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。

※ laugh heartily 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。

（来源：中国网学英语频道）