热也使我们的环境变得适宜生存，而且一些紫外线会穿透大气层。
Heat, too, makes our environments tolerable and some ultraviolet rays penetrate the atmosphere.
他们的预测是基于积聚在地壳的罕见同位素的水平，轻微的太阳风使宇宙射线穿透地球的大气层。
Their prediction is based on levels of rare isotopes that accumulate in the Earth's crust when weak solar winds allow cosmic rays to penetrate the Earth's atmosphere.
一开始会介绍几个今天还在使用的地面望远镜，这些望远镜体型巨大，因为他们必须能够穿透地球的大气层。
We'll begin with some of the greatest ground-based telescope systems in use today. Because they have to be able to see through the Earth's atmosphere, these telescopes are truly massive.
应用推荐