... receiver, earpiece 听筒 Earpiece volume control 调节音量 earpiece control box 心排出量计算机附件 ...
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earpiece volume control
耳机音量控制
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The earpiece has an on-off switch, a three-stage volume control and uses a rechargeable battery.
WSJ: Testing, Testing...Can You Hear Better Now?
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