... 不可为空值(Not Null):候选键的属性值不能是空值,如果是组合键,每一个属性值都保证不能是空值。 永远不会改变(Never Change):候选键的属性值永远不会改变。
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Will never change until death » 永远不会改变,直到死亡 Which of these best describe you? » 而这些最好的描述你?
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我永远不会改变 I will never change ; i never change
我永远不会改变你 i never change to you
直到永远不会改变 will never change until
我将永远不会改变 I will never change
它将永远不会改变 And it will never change
爱你永远不会改变 love you never change
友谊将永远不会改变 Friendship will never change
我的心永远不会改变 My heart will never change
现场将永远不会改变 The scene will never change
它的局部是凸的,因为它没有环路,且曲率永远不会改变符号。
It is locally convex in the sense that it has no loops and the curvature never changes sign.
有些事情永远不会改变。
钟伟认为,有些事情永远不会改变。
If you're not updating some variable by incrementing it or decrementing it -- if you're not changing anything, presumably the conditions are never going to evaluate to false or the opposite, so you're just going to have an infinite loop, which might be your goal, but odds are it's not.
如果你不通过增加或减少它来改变一些变量,-如果你不改变什么,大概那个条件永远不会变成错误的,或相反的,所以你将得到一个无限循环,那可能是你的目标,但可能也不是。
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