Everyone is born with a P. F. O., but in most individuals it closes shortly after birth.

所有人生来都会带有卵圆孔未闭，但是绝大多数人会在出生之后很快闭合卵圆孔。

youdao

The process template represents the reusable class of process parts described by P F method.

过程模板代表由P- F方法描述的部分过程的可复用类。

youdao

By means of the bin, a comparative test of tractive performance between the wedged paddle wheels and nonrim ones ofpaddy-field tractor(P. F. T. ) is analysed.

此外，还分析了在该土槽上所进行的机耕船用楔形轮与无轮缘叶片轮的牵引特性的对比试验。

youdao

which is f , divided by the value of the x-axis here.

斜率，而f是p趋于0时pV的极限。

麻省理工公开课 - 热力学与动力学课程节选

So these names, they don't really make any sense why they're called past s p and f, and it turns out that it comes from spectroscopy terms that are pre-quantum mechanics where, for example, this is called the sharp line, I think the principle, the diffuse, and the fundamental.

看到这些名字，你会发现,它们为什么叫s，p，f是没什么道理的，事实上,它们来源于,量子力学之前的光谱学中的术语，例如，它们分别叫做锐线，我认为是主线，漫射和基本。

麻省理工公开课 - 化学原理课程节选

These p-and-f projections can sometimes exaggerate trends, but just consider an economic environment where the 10-years are yielding more than 6%.

FORBES: Is PIMCO's Bill Gross Right About Bonds?