For six months of the year, there is hardly any light at the poles.
一年中的6个月里，地球的两极几乎没有任何光线。
For the last three years, light shows on the Bund have been successfully held for New Year's Eve celebrations, but this year the light show was canceled and there were fewer police on hand.
在过去的三年里，外滩的灯光表演在新年前夜的庆祝活动上成功举办，但今年的灯光表演被取消了，现场的警察也减少了。
Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light.
人们发现，连续一年被关在黑暗的环境中的鲎仍然可以保持稳定的大脑活动节奏，这种稳定的节奏也使得它们的眼睛适应每日或明或暗的光线。
Why do we light firecrackers on Chinese New Year?
为什么中国过新年要放鞭炮？
"You are as light as sea-shells," answered the Tunny, who was as large as a two-year-old horse.
“你们像海贝壳一样轻。”金枪鱼回答说，他有一匹两岁的马那么大。
Last year, the light-coloured car sold better than the dark-coloured ones.
去年浅色车比深色车卖得好。
By 2011 debris in the center of the ring, which is about a light-year in diameter, was blazing more intensely as the supernova entered a new stage of stellar demise.
到2011年为止，因为这个超新星进入了星球消亡的新阶段，所以这环物质中心直径大约是一光年的碎片燃烧的更加强烈了。
Winter comes with the shortest days and lowest light of the year.
冬天是一年中白昼最短光线最灰暗的季节。
The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
The autumnal equinox and vernal equinox aren't even midway between the solstices, which are the days of greatest and least light of the year, she added.
春秋分日甚至不是二至日(夏至：一年中光照最强烈的时候。冬至反之)的中分界点，她补充道。
Within just a light-year of the black hole swarm more than 100,000 other stars caught far more firmly in its grip.
仅在黑洞的一光年范围内就云集着另外十多万颗恒星，处在它更牢固的掌控之中。
It spans about 3,000 light-years in diameter, compared to the Milky Way's 100,000 light-year diameter.
它的直径大约为3000光年，而银河系的直径有100000光年。
Matese estimates Nemesis is 25,000 AU away (or about one-third of a light year).
玛提斯认为“复仇者”距太阳有25000个天文单位(或者说三分之一光年)。
Matese estimates Nemesis is 25, 000 AU away (or about one-third of a light year).
玛提斯认为“复仇者”距太阳有25000个天文单位(或者说三分之一光年)。
A short distance, to be sure, but at the time it felt like a light year.
确实只有很短的距离，但那时我却感到距离了一光年似的。
The monster, on the right, is actually an inanimate pillar of gas and dust that measures over a light year in length.
右边的怪物，实际上是无生命的气体和尘埃柱，据测长度超过一光年。
This image was produced by combining a dozen Chandra observations made of a 130-light-year region in the center of the Milky Way.
这张照片是多张钱德拉天文台的照片合成的，显示的是130光年远的银河系的中心部分。
Judges have given the green light for a 14-year-old Dutch girl to sail solo around.
14岁的荷兰少女终于获准可以独自航行环游世界了。
Scientists have already proposed that a hidden star, which they call 'Nemesis,' might exist a light-year or so away from our sun.
科学家已经提出，这颗隐藏的暗行星，他们将它命名为“Nemesis”，可能存在于距离我们的太阳大约一光年的地方。
None of those planets are like Gliese 581 g, a rocky world about three times the mass of Earth orbiting — along with five sibling planets — a red dwarf star 20 light-year from Earth.
以上说到的行星没有一个像Gliese 581g——一个轨道是地球三倍的满是岩石的世界——还有五个姊妹行星——一个距地球20光年的红矮星。
The Oort Cloud is thought to extend about 1 light year from the Sun.
欧特云团距太阳1光年距离。
Two 30,000 light-year-long blobs called Fermi bubbles have been discovered on either side of our galactic plane. John Matson reports
在银河盘面两端，发现了两个长达30,000光年的东东，它们被称作费米尔泡。
Captured here are the top of a three-light-year-tall pillar of gas and the dust that is being eaten away by the brilliant light from nearby bright stars.
照片所捕获的是由气体和尘埃所组成，高达3光年的巨柱的顶端。它被附近明亮恒星们的耀眼光芒所遮盖。
For a crew to make the 50, 000-light-year journey to the centre of the Milky Way within 10 years, they would have to travel at 99.999998 per cent the speed of light.
要在10年内飞行50000光年到达银河系中心，飞船速度必须达到光速的99.999998%。
Even if the U.S. has its third consecutive catastrophe-light year, industry profit margins will probably shrink by four percentage points or so.
即便美国已经进入了持续轻微衰退期的第三个年头，但是产业的利润很可能还是会有4%的缩水。
It's about 2 light-years long and half a light-year wide. It's located about 2, 000 light years away in the direction of the Constellation Cygnus.
它大约有2光年长、半光年宽，位于天鹅座方向，距地球约2,000光年。
It's about 2 light-years long and half a light-year wide. It's located about 2, 000 light years away in the direction of the Constellation Cygnus.
它大约有2光年长、半光年宽，位于天鹅座方向，距地球约2,000光年。
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