bivalence detail双化合价
pragmatic bivalence重语用模糊
bivalence sulfer两价硫
principle of bivalence二值原则
bivalence rare earth二价稀土金属
Bivalence of Fuzziness二值模糊
N（名词） the semantic principle that there are exactly two truth values, so that every meaningful statement is either true or false 二原子价 [logic] → compare many-valued logic