口头表达能力用英语怎么表达？

　　The expression on his face never changed.

　　他的.面部表情总是一成不变。

　　There was a bored expression on her face.

　　她脸上有一种厌倦的表情。

　　His expression changed from amazement to joy.

　　他的表情由惊变喜。