| 71. | Pulses of radiation are emitted when free electrons in the gas are accelerated by passing ions. |
| 当气体中的自由电子被掠过的离子加速时，将发出辐射脉冲。
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| 72. | Numerous other commercial enterprises, from theaters to magazine publishers, from gas and electric utilities to milk processors, bring better and more efficient services to consumers through the use of computers. |
| 不计其数的其他商业企业，从剧院到杂志出版商，从公用燃气电力设施到牛奶处理厂，都通过计算机的使用给消费者带来更好、更有效率的服务。
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| 73. | I turned the gas off at the mains before I went out. |
| 我出门之前，把煤气的总阀关掉了。
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| 74. | We are well served with gas in this town. |
| 这个城镇煤气供应得很好。
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| 75. | As a means of cooking and heating, electricity is very convenient, but where price is concerned, gas has it every time. |
| 作为做饭和取暖的手段，电是非常方便的，但就价格而言，还是每次用煤气省钱。
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| 76. | Poison gas blew off and endangered the lives of hundreds of persons. |
| 他的一条腿被炸弹炸飞了。
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| 77. | They are valuable by-products obtained in the manufacture of coal gas . |
| 它们是制造煤气时得到的宝贵副产品。
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| 78. | A bulldozer had cut a gas main. |
| 推土机截断了一根煤气总管。
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| 79. | Who first conceived the idea of filling bags with gas to make balloons. |
| 谁最先想到在袋中充气制成气球的。
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| 80. | He was intelligent enough to turn off the gas . |
| 他关掉了煤气,够聪明的。
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