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1

and in the course of a few hundred miles reaches the true ocean floor at 2 , 500-3 , 500 fathoms.

一直延伸到几百英里远深达 2,500 至 3,500 的地方，那里才是真正的海底。

2

They collected fire ants from roadsides in Georgia . They placed the ants in water in groups of 500, 3, 000, and 8, 000.

于是，科学家们在美国佐治亚州的路边采集了很多火蚁，然后，分别把数量为 500,3000,8000 蚂蚁群扔进水里。

3

Apart from temporary work for builders , the industry directly employs only 1, 500-3, 000 people, according to the University of Colorado .

据科罗拉多大学研究，除去为建筑者工作的临时工人，这一部门的直接雇佣工人只有 1500 至 3000 人。

4

It now stretches 8 , 851 . 8 km (5, 500. 3 mi), with approximately 2, 232 km of that natural barriers such as hills and rivers.

现在长城长 8,8851.8 千米，其中约 2232千米是像山丘、河流的天然屏障。

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