※ crack a smile 莞爾一笑

The man is willing to do anything to make his wife crack a smile.

為了讓他的妻子展顏微笑，他愿意做任何事情。

※ force a smile 強顏歡笑

At the funeral, he forced a smile for anyone who offered condolences.

在葬禮上，他強顏歡笑面對前來吊唁的人。

※ smile bitterly 苦笑

The student smiled bitterly when his teacher caught him copying his homework.

抄作業(yè)被老師抓到后，這個學生滿臉苦笑。

※ laugh heartily 開懷大笑

Upon hearing that he had won the lottery, the man laughed heartily.

知道自己中獎了，這個男人開懷大笑。

（來源：中國網學英語頻道）