Freedom of expression is a basic human right.
言论自由是基本的人权。
The expression in her eyes told me something was wrong.
她的眼神告诉我出事了。
His face took on a set expression.
他脸上现出凝滞的神态。
The expression on his face never changed.
他的`面部表情总是一成不变。
His expression changed from surprise to one of amusement.
他的神情由惊变喜。