1、
The tweeter of far ironworks is putting song standard of a few flame waves eastwards place.
远处炼铁厂的高音喇叭在放着歌曲,几面红旗向东飘摆.
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2、
3、
The tweeter emits the sound wave, then the capacitor microphone receives the echo.
其声波由电动扬声器发射,声波接收采用电容传声器.
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