1. crack a smile 展顏微笑，莞爾一笑

Definition: to smile, especially when you do not feel like smiling.

The man was willing to do anything to make his wife crack a smile. （為了讓他的老婆展顏微笑，他想做什么事情。）

2. laugh a hearty^{1 laugh/laugh heartily2 放聲大笑，開懷大笑}

Definition: to laugh loudly and uncontrollably

Upon hearing that he had won the lottery^{3, the man laughed heartily. （了解自己中獎了，這個男性開懷大笑。）}

3. force a smile 強作歡顏

Definition: to smile even though you feel sorrowful or unhappy

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。）

4. a saccharine^{4 smile 諂笑，諂媚的笑}

Definition: a smile designed to please others

When he talks to his boss, he puts on a saccharine smile. （他跟老板說話的時候，滿臉都是諂媚的假笑。）

5. smile bitterly 苦笑

Definition: to smile when you have no choice or can do nothing to help

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。）