看它切开!
I twist my neck, trying to catch her expression, but I can see only half of it: flutter of eye, curve of lip, and slice of cheek.
我扭转脖子,想看看她的表情,可也只能看到一半儿:眼睛的煽动、嘴唇的弧度,面颊的一片儿。
So, remember, when we did it first over z, we start by fixing a point, x and y, and for that value of x and y, we look at a small vertical slice and see from where to where we have to go.
要牢记,当我们对z积分时,首先固定一个点,看看它们的值,取一个垂直切片,并找出z的积分限。
应用推荐