The fragments themselves almost certainly contained no sulfur, but astronomers believe that the cloudlayer below Jupiter's outer atmosphere does contain sulfur.
这些碎片本身几乎不含硫，但天文学家相信，木星外层大气之下的云层中确实含有硫。
2
Darkness was coming early because of the cloudlayer that still blanketed the sky.
由于空中仍然垂着沉甸甸的乌云，天黑得较早。
3
Some of the heat radiates into space, but much of it bounces off the cloudlayer and goes back into the ground.