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21. | poor incoming part |
| 事件不良 |
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22. | objectionable performance |
| 不良表演 |
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23. | objectionable publication |
| 不良刊物 |
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24. | undesirable components |
| 不良成分 |
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25. | insufficient lubrication |
| 润滑不良 |
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26. | impeded drainage |
| 不良排水 |
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27. | imperfect contact |
| 不良接触 |
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28. | to nurse poorly at the breast |
| 不良喂奶 |
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29. | ineficient combustio |
| 不良燃烧 |
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30. | defective aeration |
| 土壤通气不良 |
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