準備工作的英文單詞是什麼

Suppose the preparatory work should not be completed.

準備工作完成不了，那可怎麼辦？

Lenin did a great deal of the preparatory work for this conference.

列寧為這次會議作了大量的準備工作。

A rigorous and comprehensive approach requires some preparatory work.

應用嚴格的、綜合的方法需要作某些準備工作。