back-plate

基本解释

The team uses a linear motor to move a loudspeaker-type plate back and forwards, generating a sound wave in helium gas – which doesn't add to the greenhouse effect.
这个小组用线性马达驱动扩音器导磁版前后震动，在氮气中发出一种不会造成温室效应的声波，声波在气体中产生区域性压缩和膨胀，造成他们轮流升温和降温，珀斯说。
The film spray non-back-mixing column plate can prevent the liquid from back mixing, and greatly improve mass transfer driving force and the column plate efficiency.
该塔板可避免液体返混，大幅提高传质推动力和塔板效率。
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Does the day big mound believe and (rock'n roll poem coming into being and turn-back) have electron printing plate copy in May?
五月天阿信的（浪漫的逃亡）和（摇滚诗的诞生和转身）有没有电子版的拷贝?。
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The Magellan Wireless Back-Up Camera kit comes complete with a license plate mountable camera, transmitter, wireless receiver, vehicle power adapter, installation hardware, and instructions.
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The initiative, which dates back to 2005, involves an extensive network of security cameras, licence-plate readers and weapon-detectors which work together to spot threats and deter terrorist surveillance.
ECONOMIST: New York expands its counterterrorism monitoring system