face falls想要形容心情低落，脸色阴沉

【例句】
Her face fell when she heard he wasn't coming.
她听说他不来时脸沉了下来。

Her face fell when I told her that she was defeated in the game.
当我告诉她她在比赛中被击败了，她脸上露出沮丧的表情。