There are many more questions you could ask yourself, but I'm sure you get the idea. What will it take for you to get back into business quickly?
还有很多问题，你可以进行思考并回答，但我敢肯定你一定有自己的想法。它将会为你迅速恢复营业带来什么呢？
When you come across one you may ask yourself, "where was this declared?" and quickly mash Ctrl+F in a mad fit to find the variable's original source.
即使你自己遇到这样的变量时，你也要不由的问自己：“这是在哪里定义的？” ，然后迅速的使用Ctrl+F组合在源代码里寻找这个变量最初定义的位置。
OK, so if I give you a unit vector, you can ask yourself, if I move in the direction, how quickly will my function change?
也就是，如果我给你一个单位向量，试问，我沿着这个方向移动，我的函数值会变化得多快呢？
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