This expression is used mainly in speech, not in writing.
這種表達主要用于口語，而不是書面語。
The course teaches students to avoid ambiguity and obscurity of expression.
這門課程教學生避免表達上的模棱兩可、含混不清。
Try to put a little more expression into it!
盡量注入更多的感情！
Freedom of expression is a basic human right.
言論自由是基本的人權。
The expression in her eyes told me something was wrong.
她的眼神告訴我出事了。