over a mile high. 近两公里高的瀑布

175. It is 30 metres to the top.
     垂直落差高达30米
176. They are only an inch long.
     而虾虎鱼身长只有不到3厘米
177. This is the equivalent of a human being scaling a waterfall
     相当于人类去攀登
178. over a mile high.
     近两公里高的瀑布
179. Millions attempt the climb...
     数以百万计的虾虎鱼向顶端进发
180. ..but less than 1% will make it.
     但只有不到1%能成功登顶
181. This goby has been climbing for days.
     这只虾虎鱼已经爬了好几天了

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 178 行