However, as pointed out above, this tree might not be fully constructed if it is the first call, or if values have not been set before.

但是正如前面指出的，如果这是第一次调用，或者以前没有设置值，树可能还没有完全构造好。

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This allows you to quickly and efficiently implement new algorithms or functions that have been programmed before.

这能让你快速有效的实现先前已经编好的新算法和函数。

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When people get it wrong, it is usually medical or, especially among girls, it is that they have not been away from home before or because expectation does not match reality.

当人们把它搞砸时，往往是因为健康问题，尤其是女孩，因为她们从未离开过家，或者期望与现实不符"。

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We prove things in mathematics that have never been proven before or we find new ways to prove these theorems or what have you and we can be creative.

我们用数学去证明从未被证明过的事物,我们探寻新的方法去证明那些定理,或其他诸如此类,总之,我们具有创造力

耶鲁公开课 - 死亡课程节选

He said the track could have been broken by the accident or could have been fractured before the trains collided.

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No matter that Italians have not always been fastidious about implementing European directives or that their governments have occasionally been dragged before Europe's Court of Justice to be scolded and even fined.

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