Atmospheric radiation has also dropped .

大气中的辐射水平也有所下降。

Ramjet engines have traditionally used liquid fuel which is mixed with atmospheric air and burned to provide thrust for high-speed flight .

传统的冲压喷气发动机使用液体燃料并与大气中的空气混合燃烧，以提供高速飞行的推力。

This problem has long vexed the american military , which would like to use lighter-than-air dirigibles as atmospheric satellites , or stratellites .

这个问题长久地困扰着美国军方，他们期望能使用轻于空气的飞船，比如大气中的卫星stratellites气球系统。

These vents have naturally acidified waters that hint at how our seas might change if atmospheric carbon dioxide levels continue to rise .

这些火山口自然地增加了水的酸性，这些都会反映出，如果大气中的二氧化碳继续增加的话，我们的海洋将如何改变。

Ideally , scientists would like follow-up studies to probe titan with ground-penetrating radar and instruments to analyze the chemical history of the moon 's atmospheric methane .

理想的话，科学家们将用探地雷达设备进一步分析这颗卫星大气中的甲烷的化学成分发展史。