1. Contamination of water supplies is usually due to poor sanitation close to water sources,
    水源的污染通常是由于接近水源的地方卫条件太差而造成的：

2. Close your books.
    合上书。

3. Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land.
    100年前，我们只知道海洋是二维平面形的，以及靠近陆地浅水区的深浅不一能给航行带来危险。

4. One Saturday afternoon, I hauled the machine into the garden and had a close look at it.
    一个星期六的下午，我把割草机拉到了花园里，仔细检查了一番。

5. On the uncovered plate the bacteria on the outer ring were flourishing, but close to the mould there were none left.
    那只没有盖上盖儿的盘子的外围细菌很多，而靠近霉菌的地方却一点也没有。

6. Let´s close our books.
    让我们合上书。

7. 10.Someone close to you has been seriously hurt in an accident; you hear the news by phone.
    10.某个和你关系密切的人在事故中受了重伤，你从电话里听到了这个消息。

8. I felt sure I would never be able to close the case again.
    我相信那箱子再也关不上了。

9. It put its nose close to his mouth and ears.
    又把鼻子凑近他的嘴和耳朵。

10. In these forests there are so many trees, and they grow so close together, that it is hard to move around.
    森林里树木繁茂，不易走动。