... wire relaying 有线中继，有线转接 wire repeater 有线电中继系统 wire resistance 导线电阻，线阻 ...
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four wire repeater 四线制增音器
two-wire repeater 双线增音器
four-wire repeater 四线中继器
two wire repeater 二线式增音机
two-wire telephone repeater 双线制电话中继器
four-wire voice frequency telephone repeater 四线制话频电话中继器
wire voice frequency telephone repeater 四线制话频电话中继器
In those days the only reliable vacuum tube was the Western Electric repeater triode, and if one needed a variable resistance he wound a lot of wire on a wooden spool.
在那个时候唯一可靠的真空管就是Western Electric 中继器三极管，而如果需要变阻器时，就用金属丝缠在木卷轴上自己做一个。
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