... simply y adv 简单地;仅仅，只不过 namely y adv 即，也就是 not t nearly = far from = nowhere near 远非，远远不，一点也不 ...
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This one is a line integral. So, you use the method to explain here, namely, you express x and y in terms of a single variable.
这一个是线积分，可以用这里的办法来做，也就是用一个变量来表示出来。
Namely, we will be saying the /a normal vector is x, y, z over a, plus or minus depending on whether we want it pointing in or out.
我们容易知道,法向量为，正负号取决于它是指向外面还是里面。
Namely, let's say that you have a function maybe of three variables, x, y, z, df = fxdx+fydy +fzdz then you would write df equals f sub x dx plus f sub y dy plus f sub z dz.
即是说，如果你有一个,含自变量，x，y，z的函数，那么。
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