One- way Associations(单向关联) a class can contain more than one association with another class(一个类和另一个类可以有多 个关联) Flight ilot coPilot Pilot17 One-way Associations (单向关联) • A class can contain more than one association with another class (一个类和另一个类可以有多 个关联) Pilot Flight -pilot -coPilot