对流层的英文：
troposphere
lower atmosphere

参考例句：

The mission will also observe clouds and aerosol particles in the troposphere.
此次任务还将观测对流层中的云和气溶胶粒子。

Assessing the impact of aircraft emissions of NO2 in the upper troposphere is a complex task
确定上对流层中飞机排放出的氧化氮对大气的影响是一项复杂的任务。

in the upper troposphere, ozone is created much more efficiently and is destroyed less easily than at ground level
在上对流层中，与地面附近相比，臭氧能更有效地生成，而且更难分解。

troposphere是什么意思：
n. 对流层

The mission will also observe clouds and aerosol particles in the troposphere.
此次任务还将观测对流层中的云和气溶胶粒子。

Assessing the impact of aircraft emissions of NO2 in the upper troposphere is a complex task
确定上对流层中飞机排放出的氧化氮对大气的影响是一项复杂的任务。

lower是什么意思：
adj. 下游的；下方的；在底部的；下级的，下等的
v. 放下，降下；减少，降低

rate lower; lower in value or esteem.
降低事物的等级；让事物的价值或声望下降。

He is a teacher of a lower form.
他是低年级的老师。

To lower in quality or character;debase.
使变得低劣降低质量或品格；贬低

atmosphere是什么意思：
n. 大气，大气层，大气圈；空气；气氛，环境，氛围；引人入胜的效果；大气压；雾
v. 使具有感染力

The director cleverly atmosphered the film for added chills.
导演手法巧妙地着意渲染使电影更增添恐怖气氛。

The atmosphere was electric.
气氛很热烈。

The atmosphere of that restaurant is very nice!
那家餐厅的氛围很好！