But not all the relationships on this island are so harmonious. 但岛上的生存关系并不是都如此和谐

142. Crabs feed on dead skin on the iguana's back
     红石蟹以海鬣蜥背上的死皮为食
143. and, in turn, provide a welcome exfoliation service.
     反过来也热情地为它们提供去角质服务
144. While smaller lizards prey on the flies that pester the colony.
     小型蜥蜴还捕食纠缠海鬣蜥的苍蝇
145. But not all the relationships on this island are so harmonious.
     但岛上的生存关系并不是都如此和谐
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

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 145 行