When our star drops out of its latest sunspot activity cycle, the sun is most likely going into hibernation, scientists announced today.

科学家今天宣布，当我们的恒星脱离最近的太阳黑子活动周期时，太阳最有可能进入冬眠。

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Sleet is part of a person's daily activity cycle.

睡眠是人日常活动周期的一部分。

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Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles.

睡眠是人每天日常活动循环的一部分。人的睡眠分几个阶段，而这些阶段也是循环发生的。

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Climate scientists have already looked at changes related to Sun spot activity - a cycle of approximately 11 years - and long-term changes in the Sun's brightness, which has a cycle that lasts for centuries.

BBC: Viewpoint: The Sun and climate change

But in the current cycle, sunspot activity has collapsed.

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Sunspot activity waxes and wanes on the sun in a 11-year cycle, and we are approaching the peak of sunspot activity, probably reaching it in 2013, according to Hesse.

FORBES: Huge Solar Flares Could Spell Catastrophe for Earth