1. The conditional must produce a boolean result. 条件必须产生一个布尔结果。
2. The Boolean operation whose result has the Boolean value 1 if and only if each operand has the Boolean value 1. 一种布尔操作，当且仅当每个操作数的布尔值都为1时，它的结果的布尔值为1。
3. In Boolean algebra, an operator that indicates an executing operation and generally is located between two operands. 在布尔代数中，表示要执行的运算的算符。通常写在两个操作数之间。
英英解释
adj.
1. of or relating to a combinatorial system devised by George Boole that combines propositions with the
