For 150 million years, 1.5亿年间

329. But the ultimate sign of trust is exposing his neck.
     但最终的信任标志 是暴露出自己的脖子
330. Rising together,
     双方一起抬起脖子
331. they cement their bond.
     确定了关系
332. For 150 million years,
     1.5亿年间
333. dinosaurs ruled the planet.
     恐龙统治着地球
334. Who knows what new heights
     如果它们继续统治下去
335. they might have reached if their reign had continued.
     能达到何种新的高度 谁都不知道

来自《我们星球上的生命 第一季 第五集 Life on Our Planet S01E05 巨兽阴影下》第 332 行