If we allow for an additional 25 hours of preparatory work outside the classroom, we end up with a 60-hour work week.
如果我们再加上25个小时的课外预习，那么最后的结果是每周需要60小时。
As the man approached the bin, he took the crisp envelope from his pocket and made as if to tear it in two, preparatory to consigning it to the pile of refuse.
当男人走到垃圾箱跟前时，从口袋里取出一封崭新的信封，好像要把信封撕为两半，准备把它扔进垃圾堆里。
Part One is preparatory, and deals with the proper frame of mind that must be established if logical thinking is to take place at all.
本书的第一部分为预备性章节，探讨适宜进行逻辑思维所必须建立的思想框架。
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