它们用于提高放大电路的增益和实现输出阻抗匹配，提高电流复制精度，减小电压增益误差。
They are used to enhance the gain of amplifier and realize the impedance matching, improve the current copying precision, decrease the tolerance of voltage gain.
如果声波能够在移动的电流中复制，它们就能够被沿电线传送。
If sound wave could be reproduced in a moving electrical current, they could be sent along a wire.
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