a new dynasty was born. 一个新的王朝诞生了

145. One small step for a dinosaur,
     恐龙一小步
146. but one giant leap for life on Earth.
     地球生物一大步
147. With these early gliders,
     通过这些早期的滑翔者
148. a new dynasty was born.
     一个新的王朝诞生了
149. And it was flight that would help their descendants stay alive
     在小行星撞击地球之后的时代
150. in the era after the asteroid.
     飞行的本领 将帮助它们的后代存活下去
151. Today,
     现如今

来自《我们星球上的生命 第一季 第六集 Life on Our Planet S01E06 灰烬中重生》第 148 行