准备工作的英文单词是什么

Suppose the preparatory work should not be completed.

准备工作完成不了，那可怎么办？

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

列宁为这次会议作了大量的准备工作。

A rigorous and comprehensive approach requires some preparatory work.

应用严格的、综合的方法需要作某些准备工作。