But as he makes the same journey every other day, 但由于他每隔一天就要走一遍
This mother's chicks are hungry, but she has no food left to give them. 这几只小鸟饿了 但母亲没有食物可以喂它们
But there are some benefits from living on a volcano. 但生活在火山上还是有一些好处的
There is plenty of food in these waters, but to exploit it, 这里的水域食物充足 但若想享用美食
But, when new challenges arrive, they can struggle to cope. 但当新挑战来袭 它们只能尽力去应对
but most have now adopted a land-based existence. 但绝大多数品种现在已经适应了陆地上的生活
But the greatest threat they face is change. 但它们眼前的最大威胁已经改变