Not at all. There's no truly high mountain in continental US. I've trekked in Nepal to as high as 5416m high. No problem.
-sailor(Ocean & Mountain);
2017-8-17(#10993427@0)
业余爬山者也不需要啊?
-breezy00(渺);
2017-8-17(#10993480@0)
No, not necessary.
-sailor(Ocean & Mountain);
2017-8-17(#10993533@0)