She sat at her desk writing letters.

她坐在写字桌前写信。

youdao

He sat at the table writing a letter.

他坐在书桌旁写信。

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They all sat quietly in the classroom, reading or writing .

他们都安静地坐在教室里，或者在阅读，或者在写东西。

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They all sat quietly in the classroom, reading or writing .

他们都安静地坐在教室里，或者在阅读，或者在写东西。

youdao