他的脸上失望的表情
The look of disappointment on his face
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他说他对期末的结果不失望，但是他脸上的表情出卖了他。
He said he wasn't disappointed at the result of the final exam, but the look on his face gave himself away.
youdao
当大卫知道自己没有通过驾驶考试的时候，他的脸上流露出失望的表情。
There was a disappointed look on David's face when he knew he didn't pass the driving test.
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