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| 41. | train control acknowledger |
| 列车自动控制警惕器 |
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| 42. | We should be watchful of computer viruses. |
| 我们应该警惕计算机病毒。 |
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| 43. | Be careful of computer eyes hurt |
| 警惕电脑伤害视力 |
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| 44. | dead man feature |
| 警惕特征|安全特征 |
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| 45. | we cannot afford to turn a blind eye to them! |
| 我们对此，能不警惕！ |
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| 46. | Watchful and alert. |
| 警惕的，留神的 |
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| 47. | acknowledging whistle |
| 警惕汽笛|确认汽笛 |
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| 48. | Paying close attention;on the alert. |
| 留心着；警惕着 |
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| 49. | Look out for squalls. |
| 谨防危险，随时警惕。 |
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| 50. | acknowledging switch |
| 警惕开关|确认开关 |
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