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21. | have a keen sense of hearing |
| 听觉灵敏. |
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22. | Sharp and ingenious |
| 机警灵敏 |
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23. | sensitive barograph |
| 灵敏气压计 |
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24. | Feelers are sensitive |
| 触角灵敏 |
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25. | sensitive flame |
| 灵敏焰 |
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26. | fast-response probe |
| 灵敏传感器 |
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27. | sensitive glass |
| 灵敏玻璃 |
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28. | filament chamber |
| 灵敏室 |
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29. | have a good nose |
| 嗅觉灵敏 |
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30. | sensitive drill press |
| 灵敏钻床 |
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