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51. | programmable key |
| 可程式化按键 |
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52. | operational key |
| 操作键 |
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53. | key distribution |
| 密钥分布 |
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54. | interpretation key |
| 相片判读用样片 |
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55. | key instruction |
| 键盘指令 |
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56. | manipulating key |
| 手动键 |
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57. | key interlocking |
| 钥匙联锁 |
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58. | concentration key |
| 集合按钮|并席键 |
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59. | instruction key |
| 指令键 |
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60. | cryptographic key |
| 密钥 |
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