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无源谐振腔
| 窃听器
| 无源谐振腔 | |
| space | passive cavity |
| 窃听器 | |
| archit. | hide-den microphone |
| busin. | dictagraph; interceptor plate; tapping device |
| mil. | acoustic intercept receiver |
| space | bug; interceptor |
| tech. | detectaphone; listening device |
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| passive cavity | |||
| 无源谐振腔: 1 phrase in 1 subject |
| Air defense | 1 |
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