But as anyone who follows Apple knows, nothing is certain until it's unveiled on stage in San Francisco.

但正如任何追随下苹果的人所知道的那样，直到它在旧金山的舞台上亮相没有什么是必然的。

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They're honing our practical wisdom at this stage, since they are teaching us in what circumstances we ought to do certain actions.

在青少年这个阶段，他们通过教导我们在各种不同的情景下应该怎样反应而磨砺我们的智慧。

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After stage one you have certain information in hand, which you will use in the stage two.

在第一个阶段以后，你已经有一些信息在手了，你将会把这些信息用在第二个阶段。

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Alzheimer's sufferers, at a certain stage in their illness, seem to have an urge to get out.

BBC: 'My husband's safety is paramount'

"We are quite certain that in future all stage hypnotists will give a proper warning of the dangers involved in volunteering to take part in a stage hypnosis show, " he said.

BBC: Hypnotist cleared

"At a certain stage a person gets stale in this sort of job and the organisation needs a new man to come in with fresh ideas, " he said.

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