PF

The yearly output pf the portable computers in the factory approximates to 50,000.

该工厂袖珍计算机年产量约为五万台。

The PF is superantigen and it is secreted into liquid culture by E. coli.

渗透因子是一种超抗原，液体培养菌液中。

Histopathologically, intraepidermal acantholysis is located at the granular layer in PF and suprabasally in PV.

理上，落叶性天疱层内棘层松解位颗粒细胞层里，而寻常性天疱则位基底层之上。