由于贫困家庭的孩子经常被认为有学业失败的风险，老师们认为建议家庭只说英语是很合适的。

Since children from poor families often are identified as at-risk for academic failure, teachers believe that advising families to speak English only is appropriate.

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现在认为糖尿病经常伴有的并发症，如视力和肾功能损害，是由于缺乏对血糖浓度的持续控制所致。

The complications frequently accompanying diabetes, such as impairment of vision and of kidney function, are now thought to result from the lack of continuous control of blood glucose concentrations.

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这很有可能是由于火山爆发，因为火山爆发经常释放气体。

It's quite possible that this is due to volcanic eruptions, because volcanic eruptions often emit gases.

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So that means that we don't have to worry about things like wave functions when we're talking about Lewis structures, but because they're so simple to use and because they so often predict the electron configuration of molecules accurately, we end up using them all the time in chemistry, so it's very valuable to know how to draw them correctly and to know how to work with them.

因此这也就意味着我们在讨论路易斯结构的时候,不需要担心波函数之类的东西，但是由于路易斯结构不仅简单易用,而且用它来预测分子的电子排布,经常可以得到非常精确的结果，结果我们在化学中一直都在用它，因此知道如何正确地画出并运用,路易斯结构是非常有价值的。

麻省理工公开课 - 化学原理课程节选