But the journey will be a dangerous one. 但这将是一次危险的旅程

146. Marine iguanas lay their eggs in sand.
     海鬣蜥将蛋下在沙子里
147. In June, when the hatchlings emerge, they are vulnerable.
     每到六月 刚破壳的小鬣蜥异常脆弱
148. They must join the adults at the edge of the sea.
     它们必须到海边与成年海鬣蜥汇合
149. But the journey will be a dangerous one.
     但这将是一次危险的旅程
150. Racer snakes.
     游蛇
151. The snakes miss their chance.
     游蛇错失了这次机会
152. But more babies are hatching.
     但还有更多的小鬣蜥将孵化而出

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 149 行