an inner world where only the most adventurous dare to go. 一个只有最勇敢者 才敢涉足的地底世界
At the delta's mouth - the largest mangrove forest in the world, 三角洲河口地带有一片 世界上最大的红树林
is one of the widest waterfalls in the world - 是世界上最宽的瀑布之一
Baikal is the oldest lake in the world 贝加尔湖是世界上最古老的湖泊
Angel Falls, the highest waterfall in the world. 安赫尔瀑布——世界上落差最大的瀑布
But like all who visit the world of the high mountains 不过 与所有高山世界的拜访者一样
Mount Everest, five and a half miles above sea level and still rising - the roof of our world. 海拔5.5英里的世界屋脊 ——珠穆朗玛峰仍在不断升高
These, the highest mountains of the world, 这些世界上最高的山峰
for its world is one we seldom visit. 因为我们很少涉足它们的世界
and take their first steps in the outside world. 第一次踏足这个陌生的户外世界