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。
2
The release amount of dissociated P. F. concerned with three kinds of consolidated-wooden floor in the experiments all exceeded the national standard.
实验所用的三种强化复合木地板游离甲醛释放量均超过国家标准。
3
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.