It goes on crumbling and falling away, and in time this Wash. out grows to be a spacious cavern.

它不断地崩落、流失，到了一定时候，这样蚀走的地方就成为一个宽敞的山洞。

youdao

It goes on crumbling and falling away, and in time this Wash. out grows to be a spacious cavern.

它不断地崩落、流失，到了一定时候，这样蚀走的地方就成为一个宽敞的山洞。

youdao