A second grazing in the back-end will be necessary with any pasture if there is a tendency for it to get too rank . 任何草场如果有长得太茂盛的趋势，就需要在秋季进行第二次放牧。
The prospective battery manufacturer must choose the type of lead oxide to be used, if there is a choice . 一个新建立的制电池总厂如果有条件选择的话，它必须选择铅氧化物粉的类型。
If you had three together, two would unite against you, and then the two would start to betray each other . 如果有三个人在一起，两个人会联合起来反对第三个人，然后这两个人开始互相拆台。
When a considerable percentage are illiterate, the whole machinery of government has to take account of the fact . 如果有相当大的百分比都是文盲，整个政府机构对于这样一个事实，应该加以重视。
If a book 's on an important subject and a subject you are interested in , you will want to " chew and digest " it . 如果有一本书是讲一个重要的问题，而且又是你感兴趣的问题，那么你就得“咀嚼和消化”它。
If it is necessary to have the joints under water, they must be bedded into a box or sleeve which absolutely prevents water from penetrating in . 如果有必要在水下接头，就必须把它们安置于绝对不渗水的密封盒子或套管中。
If there had been a temperature indicator in the agency conference room, celia thought, it would have swung from "warm" to "frigid" . 西莉亚心想，广告公司的这间会议室里如果有个温度计的话，它会一下子从"温暖"降到"冰点"。
I believe, you know, that these sneak-thieves meet the boats and if the people are flustered or seasick they go off with some of the suitcases . 我相信，你知道，这些小偷专等船靠岸，如果有谁举止慌张或是晕船，他们就会拿起人家的手提箱溜走。
