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| 51. | treaty of security |
| 安全条约 |
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| 52. | Merchant Shipping (Safety) (Safety Management) Regulation [Cap. 369] |
| 商船（安全）（安全管理）规例〔第369章〕 |
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| 53. | collective security |
| 集体安全 |
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| 54. | safety box |
| 安全药箱 |
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| 55. | nuclear weapon safety |
| 核武器安全 |
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| 56. | Museum Safety |
| 博物馆安全 |
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| 57. | Safety on the Streets |
| 街道安全 |
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| 58. | safe format |
| 安全格式化 |
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| 59. | nuclear power station safety |
| 核电站安全 |
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| 60. | Safety clutch |
| 安全离合器 |
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