1)plant life,植物区系;植物 PL2)PL System,PL系统3)Propositional Calculus System PL~*,PL~*系统4)pond life,池塘生物 PL5)cereal,谷类的，谷类植物的n. (pl.)谷类;谷类食物6)formal deductive system PL*,PL*公理体系
用法和例句
The definition of formal deductive system PL** corresponding to pseudo-R0algebras and some important properties of formal deductive system PL** are given.