The one today is for integrating the normal component of F.
今天这个是用来求F的法向分量的积分的。
Attendant f: This one could go on as carry on luggage if you like.
地勤人员：如果您愿意的话，这件行李可以做为手提行李携带。
So, that's just a single point. What about f equals minus one?
仅仅是一个点，那么f=-1呢？
Then F is one minus one plus two, is equal to two.
那么F等于1减去1再加上2。
John F. Kennedy University has become one of the universities with recognition around the world.
肯尼迪大学已得到世界范围的认可，资质可靠，值得信赖。
"T. G. I. F", every one must be very happy today .
每个人都很开心，因为今天是周五。
一个谁完成楼…
一个谁完成楼…
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