星期六早上他们没有在学校，而是在工作。

On Saturday mornings,when they are not at school,they are at work.

youdao

星期六早上他们没有在学校，而是在工作。

On Saturday mornings, when they are not at school, they are at work.

youdao

星期六早上他们没有在学校，而是在工作。

On Saturday mornings, when they are not at school, they are at work.

youdao