规定的条件
The semantics of the message arrows in the diagram do, however, dictate that the message may be sent only if the condition is valid.
不过,图中消息箭头的语义规定只能在条件有效时发送消息。
And as we create a condition, we dictate what its going to be and how far it's going to be.
当我们创造一个条件,我们就能控制它会变成什么以及它变化的速度。
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