借助小型望远镜可以看清月球上的环形山.Lunar craters can be plainly seen with the aid of a small telescope.在月球的高地上留下无数环形山,有的直径达236千米.The lunar highlands are scarred by innumerable craters ranging up to 236 km in diameter.水星上的大环形山周围有很多小的环形山围...

“环形山”的英语可以翻译为：crater，ring mountain ...