1. Water was found at a depth of 30 ft.
    在30英尺深处找到了水.

2. The irregularities in depth of the shallow water close to the land bring danger to trip.
    靠近陆地的浅水区深浅不一给航行带来了危险.

3. The platforms extend to a depth of over 100 feet under the sea.
    平台深入海底100英尺。

4. The Japanese are eager to move forward and Westerners, perhaps, lag behind as they take the time for in-depth planning.
    日本人热情十足地往前走，而西方人因需要时间作详细计划，则可能落后。

5. And by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
    测出回声间隔的时间，便可算出该处海洋的深度。

6. Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.
    人们很少能看到活着的这类动物，因为它们生活在600英尺深的水下。

7. 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。

8. It extends to a depth of 3,723 feet.
    深达3,723英尺。