1.turn around 向后转，转身

例句：Mary turned around to copy her classmate's answers on the exam and was caught by her teacher.

玛丽考试时回头抄她同学的答案却被老师抓个正着。

2.once… 有一次……

例句：Once I saw an injured motorcyclist lying in the street，but nobody came to help him.

有一次我看见一位受伤的摩托车骑士躺在路上，但没人去帮他。

3.to one's dismay 令某人惊慌的是

例句：Jane awoke to find, to her dismay, she had missed her bus stop.

令简惊慌的是，她在公交车上醒来时发现坐过站了。

4.be sandwicked between 被夹在······中间

例句：I couldn't turn around to see who did it because I was sandwicked between two tall men.

我无法转过去看是谁做的，因为我被夹在两名高个子中间。