如果知道了，向量空间在单连通区域内处处有定义，那么就可以毫无顾忌地，在这个区域里使用格林公式了？

Well, if you know that your vector field is defined everywhere in a simply connected region, then you don't have to worry about this question of, can I apply Green's theorem to the inside?

youdao

他说，若不如此，一旦NRF有派兵需要，这么多国家就别顾忌要负担高昂的行动开销。

If not, he says, many countries will hold back for fear that they will bear the cost of an expensive operation if the NRF happens to be activated on their watch.

youdao

我想，他应该也是个敏感的人，有很多顾忌，有很多原则。

I think he must be a sensitive person, having lot of scruples and principles.

youdao