Little did I know then 当时的我还不知道

399. and he too is very anxious to get down to the sea.
     迫不及待地奔向大海
400. Having at last successfully reached the water,
     最终成功抵达大海后
401. he's still got a great number of hazards to face before he grows up.
     在它长大之前 还有很多危险要面对
402. Little did I know then
     当时的我还不知道
403. what hazards that little turtle would have to face
     小海龟究竟要面对怎样的危险
404. or the extraordinary lengths to which people would go
     也不知道人们会付出怎样的努力
405. to protect it and its island.
     来保护它和它的岛屿

来自《行星地球 第三季 第一集 Planet Earth S03E01 海岸》第 402 行