to clam up 沉默不语

动词短语 to clam up 用来形容一个人因为紧张，尴尬或不想谈论某件事而沉默不语。

例句

Adam was very naughty and ate all the cookies. When his mother asked where they were he clammed up and couldn't tell her.

When I was young I used to clam up when a stranger asked me a question.

请注意

另一个短语 the world is your oyster 意思是世界属于你，机遇很多，万事顺心，可随心所欲。

Now that you have your college degree, the world is your oyster!