So far, more than 350 miles of underwater galleries in the Yucatan have been mapped, 人们迄今为止已绘制了350英里的 尤卡坦半岛地下水系图
Beneath our feet are countless miles of cave shafts and passages. 我们脚下有着绵延不绝的洞窟和隧道
Eventually, over 4,000 miles from its source, 最终 在经过4000英里的流程之后
400 miles long and over a mile deep, Baikal contains one fifth of all the fresh water found in our planet's lakes and rivers. 贝加尔湖长400英里 深度超过1英里 其中淡水储量占到了全球江河湖泊淡水总量的1/5
and at its widest it's 17 miles across. 最宽的地方达17英里
battle their way for hundreds of miles upstream. 奋力逆流而上数百英里
it will travel hundreds of miles to the sea. 行程数百英里回到大海
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