当这些问题出现时，病人有时会被描述为患上了下肢动脉缺血。

When these problems develop the patients are sometimes described as having critical limb ischaemia.

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随着 Web 2.0 技术的推广，越来越多的 Web 应用程序被重新设计，在更改的过程中，这些问题出现的频率甚至会更高。

With Web 2.0 technologies taking off, more and more Web applications are being redesigned, and as they get changed, these same questions come up even more frequently.

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这些问题出现之时，空客的订单已堆积到160份：起初，空客欲达到收支平衡所需的订单数为250份，而每一次的延期都使这一数值增加。

All this comes as orders for the new airliner have stuck at around 160: each delay pushes up the number needed for break-even from the original figure of 250.

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So, he writes: To the psychologist alone can such questions occur as: Why do we smile when pleased and not scowl?

他这样写到：,对哲学家本身说,会出现这些问题：,为什么开心时我们微笑而非皱眉？

耶鲁公开课 - 心理学导论课程节选

We'll talk about - we'll raise these issues as they come up.

我们会讲到,我们讲课时遇到这些问题出现的时候再说

耶鲁公开课 - 生物医学工程探索课程节选

It's true, these questions have been debated for a very long time but the very fact that they have recurred and persisted may suggest that though they're impossible in one sense, they're unavoidable in another.

诚然，这些问题争论已久,但正因为这些问题反复出现,也许表明，虽然在某种意义上它们无法解决，但另一种意义上，却又无可避免。

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