his hangdog expression 他那羞愧的表情
a hangdog expression 羞愧的表情
hangdog expression
悲哀的表情
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I can't recall the impetus, but I do remember his hangdog expression, conveying the sense that I just didn't understand him.
想不起原因了，但我清楚地记得他一脸沮丧的样子，像是说我根本不理解他。
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