bottom face

基本解釋

Let's call that R. And, it lives between the top face and the bottom face.
稱為R，該圖形在頂面和底面之間。
So, it's something that has a bottom face, and a top face, and then some vertical sides.
它有一個底面和一個頂面，還有垂直的側(cè)面。
So, remember, when we set up the divergence theorem, we need the normal vectors to point out of our region, which means that on the top surface, n But, on the bottom face, we want n pointing down.
當(dāng)我們建立散度定理時，我們要使法向量指向區(qū)域外，即在上表面時，要指向上方。，we，want，n，pointing，up。,但是，在下表面，要使n指向下面。

My only complaint would be the clear key, which is centered at the bottom of the face.
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