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41. | preventive custody [detention] |
| 防范性的拘留 |
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42. | preventive zone |
| 预防区 |
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43. | preventive management |
| 事前预防管理 |
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44. | preventive measures |
| 预防措施 |
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45. | preventive obligatio |
| 预防义务 |
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46. | preventive safety |
| 预防性安全措施 |
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47. | corrosion preventive |
| 腐蚀预防剂 |
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48. | preventive maintenance |
| 预防维修 |
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49. | sludge preventive |
| 淤渣生成防止剂 |
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50. | preventive vaccination |
| 预防疫苗注射 |
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