一般认为小原生物是首先出现在地球上的动物。
The tiny protozoans are believed to be the first animals to have appeared on earth.
人们认为小原生动物是首先出现在地球上的动物。
The tiny protozoans are believed to be the first animals to have appeared on earth.
海洋对于所有的地球上的动物都有着极其重要的意义。我们要保证清洁，禁止污染。
The oceans are important to all animals on the Earth. We must keep them clean. We must stop polluting them.
来自南佛罗里达大学的西德尼·皮尔斯说：“在地球上，藻类的基因不可能在动物细胞内起作用。”
"There's no way on earth that genes from an alga should work inside an animal cell," says Sidney Pierce from the University of South Florida.
为了养活地球上70亿人，今天的大多数农民只种植或养殖易于大量生产的植物和动物。
To feed the seven billion people on Earth, most farmers today are growing only species of plants and farming only species of animals that are easy to produce in large numbers.
在弗兰纳里1994年出版的《未来的食客》一书中，他阐述了自己的论点，人类是地球上的一种新型动物，而且是一种倾向于破坏生态系统的新型动物。
In Flannery's 1994 book called The Future Eaters, he sets out his thesis that human beings are a new kind of animal on the planet, and are in general, one prone to ruining ecosystems.
早期人类似乎扮演了终结者的角色，使其他九种超过一吨的哺乳动物彻底从地球上消失。
Early humans seem to have played a major role in finishing offnine other mammal species that weighed over a tonne.
大象是地球上最大的陆地动物。
动物和人类在地球上共享空间，所以与我们周围的动物保持健康的关系，符合我们的最大利益。
Animals and humans share space on Earth, so keeping a healthy relationship with animals around us is in our best interest.
北极熊是地球上最大的陆地肉食动物。
Polar bears are the largest land animals that eat meat on the planet.
浮游生物为地球上一些最小和最大的动物(其中包括蓝鲸)提供食物。
Plankton provides food for some of the smallest and biggest animals on the planet, including the Blue Whale.
以脑力商数为依据，地球上最聪明的动物是人类，紧跟其后的是大猿、海豚和大象。
Based on the encephalization quotient, the brightest animals on the planet are humans, followed great apes, porpoises, and elephants.
鲸鱼是地球上最大的动物，海豚是最聪明的动物之一，鲨鱼则是最危险的动物之一。
Whales are the largest animals on the Earth. Dolphins are one of the most intelligent animals. Sharks are one of the most dangerous animals.
林蛙作为地球上最“冷”的动物之一，可以靠冬眠度过整个冬季(连心脏都停止跳动)。
One of the coolest animals (literally) on the planet, the wood frog has the ability to go into complete hibernation (including complete heart stoppage) during the winter season.
截至到目前，从地球上完全根除的传染病只有两种：天花和一种动物疫病牛瘟，他说。
So far, there have only been two infectious diseases that have been completely eradicated from the planet: smallpox, and the animal disease rinderpest, he said.
由此，地球上许多种类的植物和动物，正在走向灭绝。
And various animals are being hunted and killed. As a result, many kinds of plants and animals are disappearing from the earth.
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.
让它们能不停地在特拉华湾狂吃的原因，完全是因为老天爷在那里安排了另一种生物：马蹄蟹，地球上最古老的奇怪的动物。
Their ability to go on a sustained eating binge while at the bay is due entirely to another creature: the horseshoe crab. These bizarre animals are among the oldest on Earth.
海马栖息在世界各地的热带和温带沿海水域，这些鱼类有个独特的功能，是地球上唯一由雄性孕育未出生幼仔的动物。
Seahorses are among the only animal species on Earth in which the male bears the unborn young, a unique trait in these fish that inhabit tropical and temperate coastal waters worldwide.
他说，人、动物以及动物产品目前在地球上旅行的速度快于大多数已知病菌的潜伏期。
Today, people, animals and their products travel around the earth faster than the incubation period for most known pathogens, he says.
这项法案演化到现在，本质上要求美国人遵守地球上任何国家的所有植物和野生动物保护法规。
This law has metastasised: it now requires Americans, in essence, to abide by every plant and wildlife regulation set by any country on Earth.
利用改进了的狩猎技术，早期人类似乎扮演了终结者的角色，使长毛猛犸和其他九种超过一吨的哺乳动物彻底从地球上消失。
By improving their hunting techniques, early humans seem to have played a major role in finishing off the woolly mammoths and nine other mammal species that weighed over a tonne.
你知道，在所有的宇宙中，在成千上万的星系中，在数百万恒星和行星上，没有任何地方的动物能与地球上动物所受的不公待遇相比吗？
Did you know that nowhere else in all the Universes, and among the thousands of galaxies and millions of stars and planets, are the animals as badly treated as they are here on this Earth?
山羊般大小的动物是如何进化成地球上最大的生物的？
How did animals the size of a goat evolve into the largest creatures on Earth?
作为世界上第三大热门的沙漠，戈壁拥有数个地球上最大的沙丘以及独一无二的野生动物象濒临灭绝的戈壁熊。
The world's third largest "hot" desert, the Gobi is home to some of Earth's largest dunes, as well as unique wildlife like the endangered Gobi bear.
它们也是地球上最多产的哺乳动物——哺乳动物中五分之一是蝙蝠。
They are also the most abundant mammal on the planet - one in five mammals is a bat.
它们也是地球上最多产的哺乳动物——哺乳动物中五分之一是蝙蝠。
They are also the most abundant mammal on the planet - one in five mammals is a bat.
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