Suppose the preparatory work should not be completed.
準備工作完成不了，那可怎么辦？
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(yīng)用嚴格的、綜合的方法需要作某些準備工作。