packed with muscle... 发达的肌肉

274. so too did the snakes that fed on them.
     以之为食的蛇也兴盛起来
275. Today, there are more than 3,000 species of snake.
     如今世界上有超过3000种蛇
276. With their sinuous bodies...
     凭借其蜿蜒的身体
277. packed with muscle...
     发达的肌肉
278. they've evolved to exploit almost every habitat on Earth.
     它们进化出了 适应地球上几乎每一个栖息地的能力
279. Even the oceans.
     甚至包括海洋
280. Like many reptiles,
     与许多爬行动物一样

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 277 行