biconditional statement

例句：

1. 1.In a biconditional statement, both conditions must be true for the statement to be true.
   在双条件陈述中，两个条件都必须为真，陈述才为真。
2. 2. The biconditional statement is used to describe a situation where two events must occur simultaneously for the outcome to be certain.
   双条件陈述用于描述一种情况，其中两个事件必须同时发生才能确保结果确定。
3. 3. In mathematics, a biconditional statement can be used to express a condition that must be met for a result to bevalid.
   在数学中，双条件陈述可以用于表达一个必须满足的条件，以确保结果有效。