| 31. | She placed a finger to her lips to signal silence. |
| 她把手指贴近嘴唇示意安静。
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| 32. | A train must not pass a signal that is at danger. |
| 火车切不可越过危险信号。
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| 33. | The navy has picked up a radar signal from the missing boat. |
| 海军偶然收到了从失踪的船上发来的雷达信号。
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| 34. | The troops received the signal that the attack was to begin. |
| 部队收到了即将发起进攻的信号。
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| 35. | Don't start yet—wait for the signal . |
| 现在别开始，请等候信号。
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| 36. | This opinion poll is a clear signal to the President that the voters do not support his foreign policy. |
| 这次民意测验向总统清楚地表明选民们不支持他的外交政策。
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| 37. | The ship was flying a distress signal . |
| 这船悬起遇难的信号。
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| 38. | A siren is used as a fire signal . |
| 警报器用做火灾信号。
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| 39. | We live too far from the city to get a strong television signal . |
| 我们住得离城太远，收不到很强的电视信号。
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| 40. | His remark was the signal for the argument. |
| 他的这番话引起了这场争论。
|