If left alone, they eventually can grow large enough to cover the cornea and impair sight.

如果不加治疗，它们最终会增大到足以覆盖角膜从而损伤视力。

youdao

The elements, if left alone, would return to these natural places, since it was their nature to do so.

如果没有外力作用，这四种元素都会处于它们天然的位置，因为这是它们的本性。

youdao

And with those repetitive, perplexing and monotonous noises, I cannot but feel as if left alone and helpless in an exotic land.

而由于那些重复的、令人困惑的和单调的噪音，我禁不住觉得自己好像单独而无助地被留在一个异域。

youdao

If left alone,what they do is will put native medicines or some unwanted medicines and spoil their eyes.

VOA: standard.2010.05.25

Marley would attack the furniture,walls and doors until his feet bled if he was left alone in the house during a storm.

VOA: special.2009.02.23

Unfortunately if left alone employers will not create enough jobs in recession to keep unemployment low.

CNN: Unemployment in Europe: Is there a solution?

That's because treatments have side effects, whereas the tumor might never have caused problems if left alone.

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If left alone, he said, all they want is to find someone to lead them back to the barn.

WSJ: Kentucky Derby: Do Horse Races Really Need Jockeys?