| 71. | Keep tight hold of this, so as not to drop it again. |
| 抓紧点，免得再把它掉了。
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| 72. | A hush came over the crowd so that you could hear a pin drop . |
| 人群突然安静下来，静得连针落地也听得见。
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| 73. | A constant drop falling on a stone will wear a hole in it. |
| 滴水不断，可以穿石。
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| 74. | In a long drop , they reach speeds of 60 miles an hour and more. |
| 在一个长长的跌落过程中，它们可以达到每小时60里甚至更快的速度。
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| 75. | As far as I could see, it needed only a minor adjustment: a turn of a screw here, a little tightening up there, a drop of oil and it would be as good as new. |
| 在我看来，只需稍加调整即可。这儿紧紧螺丝，那儿固定一下，再加几滴油，就会像新的一样了。
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| 76. | As the time and cost of making a chip drop to a few days and a few hundred dollars, engineers may soon be free to let their imaginations soar without being penalized by expensive failures. |
| 由于制造一块芯片的时间已缩短至几天，费用也只有几百美元，因此，工程技术人员可能很块就可充分发挥他们的想像力，而不会因失败而造成经济上的损失。
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| 77. | A drop in the President's tone, a shift of his eyes to Hopkins, told Pug he was now overstaying his time. |
| 总统的声调突然沉了下去，目光向霍普金斯一瞥，这使帕格知道他逗留的时间已经过长。
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| 78. | An electron can drop from a higher level to a lower one with the emission of packet of electromagnetic radiation. |
| 利用电磁辐射束的辐射，能使电子从高能级落到低能级。
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| 79. | Sooner or later, the sand and the particles of rock drop from the wind to the ground. |
| 砂土和岩石的碎粒迟早会从风里落到地面上。
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| 80. | Could you drop me off at the airport? |
| 你能载我到飞机场吗？
|