英语听力：探索发现 科学新发现：我们的大气层-12
时间：2018-12-27 作者：英语课 分类：探索与发现2014年
英语课
Our atmosphere is in constant motion; the moving air that causes our weather circulates between the ground and 50,000 feet. It is the sun that drives this movement. When solar energy reaches earth, it heats the surface and atmosphere, but it does so unevenly 1. This temperature difference causes the air to move. Hot air near the equator expands and rises; cold air at the poles becomes denser 2 and sinks. Noah’s Marty Ralf can track its movement over the globe on the revolutionary science on a sphere simulator.
Portrayal 3
What we are seeing here is a portrayal of the air surface temperature, and red and warm colors are warm temperatures like we see in the tropics here, up in the poles you see the blues 4 and greens, those are the colder surface temperatures. So we can watch this, and actually see the warm air moving northward 5, the cold air moving southward, and we can see the changes in the seasons.
If the atmosphere didn’t move, the poles would be 45 degrees cooler, and the equator, 25 degrees warmer. The great deserts of the Sahara, Atacama and Mojave would expand dramatically. Northerly cities like London or Boston would be locked in an icy winter. It is only the atmosphere’s circulation that prevents this. It regulates the temperature, moving the air to create the weather that covers our globe.
1 unevenly
adv.不均匀的
- Fuel resources are very unevenly distributed. 燃料资源分布很不均匀。
- The cloth is dyed unevenly. 布染花了。
2 denser
adj. 不易看透的, 密集的, 浓厚的, 愚钝的
- The denser population necessitates closer consolidation both for internal and external action. 住得日益稠密的居民，对内和对外都不得不更紧密地团结起来。 来自英汉非文学 - 家庭、私有制和国家的起源
- As Tito entered the neighbourhood of San Martino, he found the throng rather denser. 蒂托走近圣马丁教堂附近一带时，发现人群相当密集。
3 portrayal
n.饰演；描画
- His novel is a vivid portrayal of life in a mining community.他的小说生动地描绘了矿区的生活。
- The portrayal of the characters in the novel is lifelike.该书中的人物写得有血有肉。