And if the curl is zero then it means that this force does not generate any rotation effects.

如果旋度是0，就意味着，这个力不产生旋转作用。

youdao

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。

youdao

There is a catch, however. Supplying trillions of dollars of reserves and driving interest rates to zero cannot force banks to lend or companies and households to borrow.

有一个难题就是，提供再多储备，利率降得再低，也不能强制银行、公司和个人进行借贷。

youdao

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