也有道理。不过，不是在恶劣天气或去登冰山顶，的确不必。

我想目前的议题是一般的山地摄影。

Btw, the cell phone company can pin point the origin of any phone call. The guy who called from Mt Hood WAS very quickly located with the call he made although he did not or could not tell his onw location in the call, but no one could reach him until he was well frozen into a rock.