的确，笑之现象应该列为世界最伟大的奇迹之一。
Indeed, the phenomenon of smiling should be added to the list of the greatest miracles of the world.
我正在大峡谷的边上，自然世界上最伟大的奇迹之一。
I was on the edge of the Grand Canyon, one of the wonders of the natural world.
然后登上群山中的最高峰，你就可以看到人类历史上最伟大的奇迹之一：长城。
But then, running along the highest ridges of the mountains, you see it: the great Wall - one of the great marvels of human history.
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