When these great ice sheets retreated, they left pulverized rocks in their wake, the foundation for fertile soil and some of the richest natural grasslands in America. 当这些大冰原消散,它们离开岩石,肥沃的土壤和一些最富饶的美国...
Calves born during the journey will be tested. 在旅途中出生的小牛将受到考验。 Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history. 究其牛群被吸引到黄石高原的原因，其线索就深...
A little success for one of the cubs. 有只幼崽获得了小成功。 This mother bear's experience gives her family a good chance of survival until spring arrives. 这位熊妈妈的经验给了她的家庭生存到春天到来很好的机会。 T...
Deep snow is still a novelty for her cubs, but she is much more focused. 厚厚的积雪对她的幼崽们来说仍然是一个新鲜事物。但她必须更加集中。 Let by her nose, she risks a 300-pound bulk on the thin ice of the bend in the S...
The end of winter comes late to the mountainous northwest of the United States, and in particular, it lingers in Yellowstone. 寒冷的冬季在美国西北部山区迟迟才结束,尤其是它逗留在黄石公园不肯离去。 The heart of Yellows...
For six months, Yellowstone endures an unrelenting winter. 在6个月中, 黄石忍受着一个冷酷的冬天。 An ice world of hunters and hunted, but now footsteps on the slops of a mountain herald a changing of a season. 那时是在一个猎人和...
Saturns apparently peaceful appearance is due to a haze of high level ammonia in the upper atmosphere, 土星明显和平的外表是由于在大气层的上方朦胧的高浓度氨所致, by looking deep into Saturn in the infrared, using the planet...
Spotting these rings from a backyard telescope is a treat. 从后院的望远镜观察这些土星环是一种不错的选择。 In an instant, they can all but disappear when Saturn tilts toward the sun. 在一瞬间, 当土星朝太阳倾斜他们会...
Saturn might be the second largest planet in the solar system. 土星可能是太阳系第二大的行星。 But like gas giant neighbour Jupiter, it's a triumph of show over substance. 但就像巨大的气体邻居木星一样,这是一种物质胜利...
Around Jupiter, around we find inside rings. 在木星周围,我们发现内部的环。 If you want to ask fundamental questions about the solar system in general, 如果你想问太阳系系统最基本的问题， Saturn would be the place we go. 土...
Imagine boarding a flight to Saturn, what would you need to know before travelling? 想象登上一架前往土星的航班,你知道在旅行之前需要了解什么吗? The best ring sight-vantage points. 最佳的景点观测地。 The must-see mo...
No planet beats Saturn for jaw-dropping beauty. 没有一个行星比土星更为美丽。 Saturn is the most photogenic planet in all the solar system. 土星是所有的太阳系中最上镜的星球。 Some of the pictures are to dye for. 有些照片...
So in some ways, a voyage to Mars could be a voyage home. 所以在某些方面,火星之旅可能是一次回家的旅程。 Our ancestors have made such bold trips before, 我们的祖先之前已经进行了如此大胆的旅行, when we walked at...
Come back six months later and it's like a different world. 六个月后回来,它就像一个不同的世界。 The sun is shining. 阳光闪耀。 It's wet. It's warm. 很湿，很温暖。 Things are alive and skirring around. 东西都是活的,而...
As the size of a small car and it has a nuclear power source so you don't have to worry about dust accumulating on solar eraser, anything like that. 而对于小型车的规模,它搭载着核电源,所以你不必担心灰尘在太阳能上累积那样...
