Stick your face right up to the newborn baby and go like this and stick your tongue out.

把你的脸凑到婴儿的面前,像这样对婴儿做鬼脸,把你的舌头伸出来

耶鲁公开课 - 心理学导论课程节选

See this happens every semester that the chuckles, the grimaces, kind of roll through the crowd as people catch on, but there you go.

每学期学生们看到这，就会偷笑或者做鬼脸之类的，不过你们随意。

哈佛公开课 - 计算机科学课程节选