这里我们并没有曲面定向的概念，能做的就是，从两个法向量中选出一个作为正方向。

Here we don't have a notion of orienting the surface other than by precisely choosing one of the two possible normal vectors.

youdao

一个动态的SOA服务器能够很容易的实现这个“通用”URI概念而无需任何重定向，它只需把请求格式的内容按需提供即可。

A dynamic SOA server can easily implement this "generic" URI concept without any redirection, just by rendering the content in the requested format on demand.

youdao

Shell（包括 bash）还有存在 here-document 的概念，它是另一种输入重定向形式。

Shells, including bash, also have the concept of a here-document, which is another form of input redirection.

youdao