超过1/4的7岁儿童不会正确地做加法。
当加法的和是一个两位数或做乘法和减法时,查尔斯便无能为力。
Sums involving two-digit numbers or multiplication or subtraction were beyond him.
这是因为人在做加法时使用的神经单位和控制眼球向右转动的是同一个,而做减法的则刚好对应控制眼球向左转动的那一部分。
Because adding used the same brain circuits as when eyes moved right. And subtraction matched up with the neurons firing when eyes moved left.
But let's suppose that I realize that I'm doing a lot of addition in my programs, and I actually want to factor out what seems to becoming a lot of copy, paste.
但是假如我在程序中做了很多加法,我实际上想要提出那些,复制粘贴的东西。
If you're writing a one line function, whose sole purpose in life is addition, and, clearly, this is about addition, well, then it's, in fact, A reasonable to use a shorter symbol like A, but I do have to specify it's type.
如果你在写一个一行的函数,它唯一的目的是,做加法,显然这是关于加法的,好的,实际上,用一个短的标识符是合理的,像,但是我必须指明它的类型。
It doesn't matter the sequence in which you add the two vectors.
在做两个矢量的加法时无所谓相加的顺序
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