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51. | leakage protection |
| 泄漏保护 |
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52. | protection ecology |
| 保护生态学 |
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53. | Protection Officer |
| 保护官员 |
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54. | heat protection |
| 防热 |
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55. | protection potential |
| 保护电位 |
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56. | Protection Unit |
| 保卫股 |
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57. | protection racket |
| ph.1. (黑社会势力的)勒索"保护"费的行径 |
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58. | product protection |
| 产品保护 |
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59. | protection ring |
| 保护环 |
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60. | boundary protection |
| 边界保护 |
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