OK, so maybe I should re-explain that again.
也许我应该重新解释一遍。
Let me re-explain quickly how I got a normal vector for the cylinder.
我来再次解释一下如何得出这个圆柱面的法向量。
Rather than re-explain them every time they're used, we document them as distinct data types (though in reality they're numbers and strings).
我们将这些数据类型(数值和字符串)列表,这样在你使用这些数据类型的时候可以更加方便。
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