Only by getting to deeper water 只有进入更深的水域

231. Every lucky escape...
     每一次幸运的逃脱
232. ...brings it closer to the water's edge.
     都使它离海岸更近一步
233. Yet even those that reach the oceans aren't safe.
     但是到达海洋的小海龟也并不安全
234. Only by getting to deeper water
     只有进入更深的水域
235. can it avoid the pterosaurs...
     才能避开翼龙
236. and escape into the blue.
     逃入蓝色的海洋
237. Reptiles once ruled the skies and the waves.
     爬行动物曾统治天空和海洋

来自《我们星球上的生命 第一季 第四集 Life on Our Planet S01E04 冷血动物》第 234 行