他的脸上露出尴尬的笑容。

There's an embarrassed smile on his face.

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他说着，意识到这太讽刺，忧郁的脸上泛过一丝尴尬的笑容。

As he talks, he recognises the irony of the story and his melancholic face breaks into a quick laugh.

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尴尬笑容的表现包括目光向下和时而不经意流露出的蠢笑。

The embarrassed smiles we display involve looking down and sometimes we emit a silly little laugh.

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