记住，当写的是近似值时，两边并不完全相等，但如果取很小的变化时，那么，最终两边的值将越来越接近。
Remember when we write approximately equal that means it is not quite the same, but if we take smaller variations then actually we will end up with values that are closer and closer.
设置指定点像素为最接近指定色的近似值。
Sets the pixel at the specified point to the closest approximation of the specified color.
循环经常被用于进行数值运算的程序中，这种程序往往是有一个近似值作为初始值，然后逐渐迭代去改进以接近真实值。
Loops are often used in programs that compute numerical results by starting with an approximate answer and iteratively improving it.
好，我试试求2的平方根，我当然不希望得到一个完全准确的答案了，但是我得到了一个近似值，试试将这个数平方一下，你会发现结果和2相当接近。
All right. I tried it on 2, I surely didn't expect a precise and exact answer to that but I got something, and if you square this, you'll find the answer kept pretty darn close to 2.
好，我试试求2的平方根，我当然不希望得到一个完全准确的答案了，但是我得到了一个近似值，试试将这个数平方一下，你会发现结果和2相当接近。
All right. I tried it on 2, I surely didn't expect a precise and exact answer to that but I got something, and if you square this, you'll find the answer kept pretty darn close to 2.
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