It is. It's drawn like an array, it effectively is an array so bracket zero means go to the zero's location in that array, which happens to be F and do what with it?

它看起来像个数组，实际上也是一个数组,所以【0】就是定位到那个数组的0的存储单元，对于f发生了什么？用它做什么？

youdao

z I do F dot n. That just gives me the z component which might involve x, y and z.

把F和n做内积，于是得到,它由x，y，z组成。

youdao

F: Really? How do you know which bills are marked?

朋友：真的吗？你们怎么知道哪些钱作了记号呢？

youdao

Instead of the F-22 the military will now have to make do with the F-35, a jet that has yet to go into production.

FORBES: Magazine Article

In other words, most of the increases in the acquisition cost of the F-35 have nothing to do with the performance of the prime contractor.

FORBES: Super-Weapon: Why Have F-35 Fighter Costs Increased?

The problem is--assuming the F-35 sees the light of day in a timely manner--that this aircraft simply doesn't do the job in air-to-air combat that the F-22 does, nor does it have the F22's ability to penetrate sophisticated defenses.

FORBES: Magazine Article