火星大小几乎是地球的一半质量是地球的1/10.
Mars is nearly half the size of Earth but around one tenth the mass.
由于地球看起来是个球形，同一时间太阳只能照到地球的一半。
Since the earth looks like a ball, the sun can shine on only half of it at a time.
GD 362的直径约为地球的一半，质量却和太阳差不多，因此比地球更致密。
GD 362's diameter is about half of the Earth's, but its mass is about that of the sun, making GD 362 far more dense than our planet.
虽然火星的表面积相当于地球的陆地面积，但是它的直径只有地球的一半，密度也小于地球，只有地球体积的15%，地球质量的11%。
Even though Mars has almost the same land surface area as Earth, it has only half the diameter and less density than Earth - possessing roughly 15% of Earth's volume and 11% of its mass.
地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。
This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.
到20世纪90年代，地球上原有的雨林只剩下不到一半，而且它们每年都继续以惊人的速度消失。
By the 1990's, less than half of the earth's original rain forests remained, and they continued to disappear at an alarming rate every year.
与男性同行相比，申请地球科学博士后学位的女性收到优秀推荐信的概率几乎只有男性的一半。
Female applicants to postdoctoral positions in geosciences were nearly half as likely to receive excellent letters of recommendation, compared with their male counterparts.
世界上有一半种类的动物、植物和昆虫生活在地球的热带雨林中。
One half of the world's species of animals, plants and insects live in the Earth's rainforests.
目前地球上，超过一半的动植物物种都生活在热带雨林之中。
Rainforests currently hold more than half of all the plant and animal species on Earth.
森林中包含着地球上一半的碳资源，形成了巨大威胁。
Since forests hold half of all terrestrial carbon, this presents a huge threat.
而地球上的光合作用仅仅为之前的三分之一到一半。
We now co-opt between one third and one half of all the photosynthesis on the planet.
一份新报告警告称，人类对自然资源的需求量在不到50年内翻了一番，目前已超出地球供应能力的一半。
Human demands on natural resources have doubled in under 50 years and are now outstripping what the Earth can provide by more than half, a new report has warned.
闯入地球的小行星一般被认为是白垩-第三纪灭绝，即恐龙遭受大灭绝的主要原因之一。 那次毁灭性事件灭绝了地球上超过一半的物种，为哺乳动物成为地球上的首要物种扫清了道路。
The extinction was caused by a massive asteroid slamming into Earth at Chicxulub in Mexico.
这个理论认为，在早期的时候，地球曾经被一颗火星般大小(相当于地球体积的一半)的行星撞击。
An object about the size of mars-half the size of earth-slammed into our planet very early in its formation, the theory says.
我们认为地球上水资源是无限的，这句话只对了一半，因为每一滴雨水都会汇入海洋而海洋里的水又能蒸发到天空中。
Our trust in Earth's infinite generosity was half right, as every raindrop will run to the ocean, and the ocean will rise into the firmament.
据他所观察，地球上有一半的活体有机物是由细菌组成，这些细菌种类繁多，有着数不胜数、未经发现的基因。
As he observes, half the mass of living organisms on the planet is made of bacteria and these bacteria are divided into zillions of species with countless unidentified genes.
湿热的热带丛林里丰富多彩的野生生物构成了整个地球动植物种类的一半还要多。
The colourful wildlife found in tropical humid forests makes up more than half of the animal and plant species on Earth.
现在估计地球上大约一半的生物生活在地下深度约5千米以下的地方。
Current estimates suggest that half of all the living matter on Earth lives underground, at depths of up to 5km.
地球上大约一半的原始森林被砍伐殆尽。
About half the Earth's original forest area has been cleared.
使用从其他来源收集到的钾(另一种主要元素)的数据，放射热估计能够占地球产生的热量的一半。
Using data gathered from other sources on potassium-the other major element-they were able to estimate that radiogenic heat accounts for half of the heat produced by the Earth.
地底下还是有很多的石油（我们目前已经消耗了地球一半的原油储备），但原油的终结可能是好几十年之外的事情，但它的开端已经开始了。
There is lots of oil still in the ground (we’ve used about half of the planet’s generous endowment), but while the end of oil may be many decades away, the beginning of the end is now.
地球史上发生过几次迅速的全球变暖，均由扩大化的反馈作用引起，每一次，都有超过一半的动植物从地球上消失。
Several times in Earth's history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct.
该地区面积占地球表面的一半，居住着世界人口的59%，而遭受的自然灾害占世界的70%以上。
The region covers half of the earth's surface, is home to 59% of the world's population, but has had over 70% of the world's natural disasters.
答案：由于地球看上去像一个球，太阳一次只能照到它的一半。
Since the earth looks like a ball, the sun can shine on only half of it at a time.
当时，距离地球约236000英里（380000公里），图片显示了地球的另一半，从伊斯坦布尔到开普敦及其以东地区，笼罩在一片夜色之中。
Shot from a distance of about 236, 000 miles (380, 000 kilometers), this image shows half of Earth, from Istanbul to Cape Town and areas east, shrouded in night.
大部分人不会意识到微生物的存在，因为他们的肉眼看不见，但事实上，微生物占据了地球大约一半的生物量，而所有的动物加起来，也不过占地球总生物量的千分之一。
Most people don't realize it, because they're invisible, but microbes make up about a half of the Earth's biomass, whereas all animals only make up about about one one-thousandth of all the biomass.
尽管地球上水资源丰富，但是超过97%的水为咸水，而在剩下的不到3%的水又有一半以上要么是冻结在两极，要么是构成了冰川。
THERE is a lot of water on Earth, but more than 97% of it is salty and over half of the remainder is frozen at the poles or in glaciers.
同样的，木星距离地球是如今距离的一半，也会对地球有一个相似的力场，Barnes补充道。
Likewise, a Jupiter about half the distance to Earth as its present location would have had a similar steading hand, Barnes added.
豪厄格-古尔·伯格说海洋是地球的“心和肺”，释放出世界上一半的氧气，吸收30%人类制造的二氧化碳。
Hoegh-Guldberg said oceans were the Earth's "heart and lungs", producing half of the world's oxygen and absorbing 30 percent of man-made carbon dioxide.
豪厄格-古尔·伯格说海洋是地球的“心和肺”，释放出世界上一半的氧气，吸收30%人类制造的二氧化碳。
Hoegh-Guldberg said oceans were the Earth's "heart and lungs", producing half of the world's oxygen and absorbing 30 percent of man-made carbon dioxide.
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