他们双手托着下巴，全神贯注地盯着窗外或天花板。
With their chins on their hands
With their chins on their hands
，they occupy themselves by staring out of the window or up the ceiling.

【答案】With their chins on their hands

【解答】

【点评】

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发布：2024/6/27 10:35:59组卷：0引用：1难度：0.8

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他们双手托着下巴，全神贯注地盯着窗外或天花板。With their chins on their handsWith their chins on their hands ，they occupy themselves by staring out of the window or up the ceiling.