Luckily, everything goes well, Chang'e 4 has worked on the "dark" side for over 5 months.

幸运的是，一切都很顺利，嫦娥四号已经在暗面工作了5个多月。

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When crayfish are kept continuously in the dark, even for four to five months, their compound eyes continue to adjust on a daily schedule for daytime and nighttime vision.

当小龙虾持续被关在黑暗的环境中，即使是4到5个月，它们的复眼仍然可以继续按照日常生活时间，对昼夜视觉进行调节。

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But it doesn't make sense to live by a 24-hour clock in the Arctic, where it's dark or light for months at time.

但是在北极，每次白天和黑夜都要持续好几个月，24小时的生物钟似乎没什么意义。

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It begins slowly, during the dark months of winter.

VOA: special.2009.08.12

The woman of action was ordered to remain quiet for months in a dark room, or become blind.

VOA: special.2009.07.26

Check back next Wednesday for our experts' tips on those long, dark months of job-seekery.

CNN: Web tips for the newly unemployed

But while the winter months are dark, treacherous and shrouded in a white uniform of snow, summer brings with it the chance to see this part of the world in all its green grassy goodness.

CNN: Summer in Lapland, land of the midnight sun

Buckingham's sanguine outlook notwithstanding, most advisers see the home builders' sharp drops in the past three months as dark omens from the market that cast significant doubt on the ability of the real estate boom to continue.

FORBES: Lone Wolf Home Builder Bull