激活的两端应连接到一个对象生命线或连接到另外一个激活。
Both ends of an Activation should be connected to an Object Lifeline or to another Activation.
从各个框垂下来的虚线称为对象生命线，表示在对方案建模期间对象的生命跨度。
The dashed lines hanging from the boxes are called object lifelines, representing the life span of the object during the scenario being modeled.
从各个框垂下来的虚线称为对象生命线，表示在对方案建模期间对象的生命跨度。
The dashed lines hanging from the boxes are called object lifelines, representing the life span of the object during the scenario being modeled.
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