1. A biconditional statement is a statement that is true if and only if both conditions are satisfied.
双条件陈述是一个只在两个条件同时满足时才为真的陈述。

2. The biconditional operator is often used in logic to express equivalence between two statements.
双条件运算符常用于逻辑中来表示两个陈述之间的等价关系。