Often a constraint message needs to be "customized" in a particular context because what appears to be one constraint is indeed two different constraints applied in different contexts.
一条约束消息需要在特定上下文中“自定义”通常是因为，看似是一个约束的内容，实际上是两个适用于不同上下文的不同约束。
Often a constraint message needs to be "customized" in a particular context because what appears to be one constraint is indeed two different constraints applied in different contexts.
一条约束消息需要在特定上下文中“自定义”通常是因为，看似是一个约束的内容，实际上是两个适用于不同上下文的不同约束。
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