And so one string must be pulling in this direction and the other string must be pulling in this direction so that the net force on the system is zero.
因此一条细绳施加一个拉力，朝这个方向，另一条细绳也必然施加拉力，朝这个方向，这样整个整体合力为零。
And so one string must be pulling in this direction and the other string must be pulling in this direction so that the net force on the system is zero.
因此一条细绳施加一个拉力，朝这个方向，另一条细绳也必然施加拉力，朝这个方向，这样整个整体合力为零。
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