Long before the existence of birds, 在鸟类出现之前很久

219. But each one now has its own gauntlet to run...
     但现在每一只小海龟都要面对考验
220. as they instinctively head towards the ocean.
     它们本能地朝着海洋前进
221. Pterosaurs.
     翼龙
222. Long before the existence of birds,
     在鸟类出现之前很久
223. this group of ancient reptiles made a huge evolutionary step.
     这群古代爬行动物 就迈出了巨大的进化步伐
224. They took to the wing...
     它们展翅高飞
225. ...and became masters of the air.
     成为天空的主人

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 222 行