| 21. | set one's watch by the radio time signal . |
| 按无线电报时信号对表。
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| 22. | She set a finger to her lips to signal silence. |
| 她把一个手指放以嘴唇上，示意不要出声。
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| 23. | signal a switch to "on " |
| 把开关按到“开”
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| 24. | When the ship received the signal , she hove to. |
| 那条船收到信号后就顶风停下了.
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| 25. | This radio signal has a frequency of 200,000 cycles per second. |
| 这种无线电信号的频率是20万赫兹。
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| 26. | The flagship flashed a signal to the fleet. |
| 旗舰向舰队发出灯光信号。
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| 27. | For five years the war raged without any signal success for either side. |
| 双方激战5年，没有一方取得任何重大胜利。
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| 28. | Early next morning, she heard planes passing overhead and wondered how she could send a signal . |
| 第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。
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| 29. | Fortunately, a pilot saw the signal and sent a message by radio to the nearest town. |
| 幸运得很，一位飞行员看到这个信号，用无线电给最近的城镇发了报。
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| 30. | The change met the technical requirements of the new age by engaging a large profess signal element and prevented the decline in efficiency that so commonly spoiled the fortunes of family firms in the second and third generation after the energetic founders. |
| 这种变化通过引入许多的专业因素从而适应了这个新时代的技术要求， 并且它(这种变化)防止了效率的降低。这种效率的降低在精力充沛的 创业者之后的第二代和第三代人(领导公司)的时候，经常会毁掉那些 家族公司的财富。
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