a smile on one's face
她脸上的笑容使得这一切都非常值得。
The smile on her face made it all worthwhile.
《牛津词典》
安看到孩子们脸上的笑容消失了。
Ann saw the cheer vanish from her children face.
youdao
他们脸上的笑容消失了。
The smile on their faces disappeared.
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