If left unchecked, weeds will flourish.

如果不加遏制，杂草就会疯长。

《柯林斯英汉双解大词典》

The implication was plain, if left unstated.

即使不说出来，隐含义也很明显。

《柯林斯英汉双解大词典》

If left untreated, the condition may become chronic.

如果得不到治疗，此病可能会转成慢性。

《柯林斯英汉双解大词典》

Lupus can be life threatening if left untreated.

VOA: special.2009.04.14

So, what we do as our seventh step is then figure out if we have any extra valence electrons left at all.

那么，第七步要做的是看看,我们还有没有剩下的价电子。

麻省理工公开课 - 化学原理课程节选

So, seven asks us if we have any valence electrons left, and how many valence electrons do we have left?

那么，第七步问我们是否还有价电子剩下，我们剩下了几个价电子？

麻省理工公开课 - 化学原理课程节选

In a worst-case scenario, if left untreated, this condition could increase the chance of developing cancer.

FORBES: Magazine Article

But that raises a further question: if left-handedness is beneficial, then why is it so rare?

ECONOMIST: Why some snails are left-handed

If left unaddressed, it will undermine progress toward national reconciliation, stability, and lasting peace.

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