1.Due to miswork in previous stages, they still need to do rework even after flooring.

1.由工程瑕疵，现在地板铺好了，还要返工。

2.He had done most of the writing and rewriting himself, reworking key passages again and again.

2.部分写作与修改工作都是他自己完, 一再修改了主要段落。