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21. | a slack vowel |
| 松元音 |
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22. | high water slack |
| 高潮平流 |
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23. | automatic slack adjuster |
| 自动松紧调整器 |
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24. | paraffin slack wax |
| 含油石蜡 |
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25. | a slack worker. |
| 粗心大意的工人 |
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26. | slack water period |
| 平潮期 |
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27. | slack length hose |
| 低统袜 |
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28. | Fine coal; slack. |
| 细煤;煤粉 |
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29. | slack money market |
| 银根松驰市场 |
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30. | idle; slack; lazy |
| 怠 |
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