1. 摆出严肃面孔.忍住不笑：45. to jump the gun 行动过早, 结论错误 | 46. keep a straight face摆出严肃面孔.忍住不笑 | 47. keep one's fingers crossed 交叉手指,乞求好运
2. 忍住不笑出来：keep a running account of 把教授在课堂讲的内容都记下来 | keep a straight face 忍住不笑出来 | keep an eye on 留意
3. 板着脸：physical property 物理属性 有形财产 | keep a straight face 板着脸 | crossover gasoline valve 重叠的汽油阀
4. 忍住不笑：Trophy Wife 花瓶一样的老婆 | Keep a Straight Face 忍住不笑 | Creep 阿谀奉承的人
1. Even if it's hard, try to keep a straight face.