Texture coordinates are named (s, t) in order to distinguish them from the (x, y) used for vertex positions (in literature, (u, v) is commonly used instead).

将纹理坐标命名为(s, t)是为了与用于表示顶点位置的(x, y)区分开来(从文字角度来讲，(u, v)更为常用)。

youdao

OK, so this one means we keep y constant, and partial f over partial u with v held constant, similarly.

这个的意思是，保持y恒定，而这个的意思是，保持v恒定。

youdao

If x and y were functions of t instead of being functions of u and v then it would be the same thing.

如果x，y是t的函数，而不是u，v的函数,那么还是一样的。

youdao

If you solve for that, you find y-y0=v0^/, and if you put in the v_0 I gave you, which was what, 10?

如果你解这个式子,你会得到y-y0=v0^/,如果再把我给你的v0代入,那个数是多少 10

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