It's the land we love and the land we think we know. We see America's breathtaking landscapes and wildlife as timeless, but the truth is very different. Its unique geography drives the forces of nature to extremes, shaping and reshaping the land and throwing down new challenges for life.这(zhè )也说明了经(jīng )验的重(chóng )要性，不过每个人都有第一次的时候，有人在前面领路(🌋)，会让(ràng )人少(shǎo )走很多弯路。