函数是一种对应规则,通过它当给定任何东西(作为参数)时,可以获得另一个东西(该参数的函数值)。
He who knows only his own side of the case knows little of that.
热力学第二定律不过是自然界对抗热量扩散的斗争。
The best trades are the ones where you have the most conviction.