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| 51. | The state or condition of being excited. |
| 兴奋兴奋的状态 |
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| 52. | flap check valve |
| 阀瓣式止回阀 |
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| 53. | non-return flap |
| 止回瓣 |
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| 54. | transplantation of muscle flap |
| 肌瓣移植术 |
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| 55. | quick-acting flap |
| 速闭瓣 |
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| 56. | back flap hinge |
| 明铰链 |
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| 57. | autopilot control flap |
| 自动襟翼 |
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| 58. | focus of excitation |
| 兴奋灶;兴奋中心 |
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| 59. | autopilot controlled flap |
| 自动舵控襟翼 |
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| 60. | The flap folds down |
| 帽边可以折下。 |
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