| 81. | It has to be tall because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom . |
| 井架必须很高，因为它像一个巨型滑轮组。我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。
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| 82. | His answer was to lift the vessel out of the water by a great number of ring-shaped air jets on the bottom of the craft. |
| 他的解决办法是把船体提离水面，让船在一个气垫上行驶，气垫只有一两英尺厚。船底装上大量环状喷气嘴以实现这一目的。
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| 83. | The open sea was deep and mysterious, and anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bad was flat. |
| 无边无际的海洋深邃而又神秘，凡是稍稍想过大海海底的人大概都会认为海底是平坦的。
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| 84. | Sir James Clark Ross had obtained a sounding of over 2,400 fathoms in 1839, but it was not until of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom . |
| 1839年，詹姆斯.克拉克.罗斯爵士曾测得海水深度超过2，400英寻；但直到1869年，皇家学会用英国“豪猪”号舰艇进行了几次巡航后，才在大西洋测得一个海水深度，同时能过挖掘海底，取得了研究海底的首批样品。
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| 85. | I noticed there was a hole in the bottom of his pail. |
| 这时我注意到，他那水桶的底下有一个窟窿。
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| 86. | The cable parted, and the minisub started to gather speed toward the bottom of the sea. |
| 缆绳断了，这艘微型潜艇迅速地沉向海底。
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| 87. | They sent the enemy ship to the bottom of the sea. |
| 他们把敌舰击沉。
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| 88. | She sat on the bottom stairs. |
| 她坐在楼梯最下面的一级上。
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| 89. | The new car has been redesigned from top to bottom . |
| 这种新型车全都是重新设计的。
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| 90. | The river ran as clear as crystal and if you watched closely you could now and then catch a glimpse of a trout hovering over the pebbles on the bottom . |
| 河里的流水清澈如水晶，如果仔细观看你会常常看到鳟鱼在河底的卵石上盘旋游动。
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