The seasons of the year—spring, summer, autumn and winter—make a cycle.

一年春夏秋冬四季构成一个循环。

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This picture here, we're going to come back to this later in two weeks when we start talking about vaccines, and we're going to talk about how you make vaccines for viruses and so in doing that we're going to think about the life cycle of a virus.

看这幅图片,我们两周之内还会讲到这一内容,在开讲疫苗的时候,我们要讲讲怎么制作病毒疫苗,那时我们要,讲讲病毒的生命周期

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This has the potential to make a huge impact on this election cycle and on all future politics.

FORBES: None Of The Above: 2012, A Transformational Political Year?

One code-writer's trick, for instance, was to encode dates using the 1, 461 days that make up a full leap-year cycle.

ECONOMIST: Financial technology: Beware the millennium | The

But Republican strategist and CNN contributor Alex Castellanos says Romney has already proved this cycle that he can make a comeback.

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