后板

rear plate的用法和样例：

例句

When the diaphragm of the speaker generates sound, the sound waves which are reflexed from the rear board will be sent out by the reflex pipes.当单体振膜发声时，其声音打到后板所反弹的声波，藉由反射导管将反相的声波传递出来。

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battery ventilation system

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bipolar processor