lower tension spring
... 拉力弹簧 TENSION SPRING ; Draught Spring 下拉力弹簧 LOWER TENSION SPRING 等拉力弹簧 constant force spring ...
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往下拉这儿的话,会产生向上的拉力,中间有根弹簧,它能帮助你测出力的大小了。
And if you have a pull down here and you have a pull up here and you have in here a spring then you see you have a way of measuring that force.
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