文章列表

• 1.英语听力：自然百科 黄石公园的夏天 Yellowstone—8
• This pack seem prepared to allow their young a brief foray to experience the world beyond their den. Even in Yellow Stone it is extremely rare to see ...
• 2.英语听力：自然百科 黄石公园的夏天 Yellowstone—7
• Hot water scorches and drowns the roots of trees encroaching on the valleys. It can keep the forests in check and the rich pastures / open. Those past...
• 3.英语听力：自然百科 黄石公园的夏天 Yellowstone—6
• As the migrating herds arrive in the plateaus river valleys, the spring is here. This is why they have made the journey after the famine of winter. Fo...
• 4.英语听力：自然百科 黄石公园的夏天 Yellowstone—5
• As 6 months of snow and ice begins to melt, Yellowstone starts to come back to life. Cascading snowmelt swells the streams and rivers. It's a hazard t...
• 5.英语听力：自然百科 黄石公园的夏天 Yellowstone—4
• Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history. This plateau is the created bowl of a huge sleeping vo...
• 6.英语听力：自然百科 黄石公园的夏天 Yellowstone—3
• This mother bear's experience gives her family a good chance of survival until spring arrives. They will return again and again as the thaw releases m...
• 7.英语听力：自然百科 黄石公园的夏天 Yellowstone—2
• The end of winter comes late to the mountainous northwest of the United States, and in particular, it lingers in Yellowstone. The heart of Yellowstone...
• 8.英语听力：自然百科 黄石公园的夏天 Yellowstone—1
• For six months, Yellowstone endures an unrelenting winter. An ice world of hunters and hunted. But now footsteps on the slopes of a mountain herald a ...
• 9.英语听力：自然百科 行星旅行：土星 Saturn—19
• The Prime Meridian(本初子午线) here is the longitude, the mark on the ground, from which all great voyages are measured. This is the view back to our ...
• 10.英语听力：自然百科 行星旅行：土星 Saturn—18
• Breathing from a so-dubbed scuba unit and now fitted in a cross between a super ski suit and a haz-mat coverall, future Titannauts could explore with ...