They show a surface broken into polygonal slabs by repeated freezing and thawing of the sort that happens above permafrost.
它显示了其在永久冰冻区之上的表面由于多次冰冻和融化已经成为多边形的冰板。
2
Methane in the atmosphere traps more heat near the earth’s surface, further raising temperatures, leading to more thawing, more decomposition, more CH4, etc. etc. etc.