which is why little auks have kept the ability to fly. 所以小海雀仍然需要保持飞行能力
The polar bear cubs emerge from the den in which they were born. 小北极熊从洞穴中探出头来
which tell others in the group that they must move on. 提醒蝗群中的其它成员它们应该动身了
which have more nutrition and moisture than the stems. 因为草根中的营养和水分比茎干多得多
which eventually they must to find food and water. 因为它们最后总得寻找食物和水
The pollen and nectar with which these flowers are loaded 这些花中装满了花粉和花蜜
which supports, amongst other creatures, the larvae of these midges. 用以养活其它生物 例如这些蚋的幼虫
These are not the sort of conditions in which you would expect to find fish, 鱼类似乎不太可能生活在这种环境中
which they use as a refuge from predators. 这里是它们躲避天敌的地方
all of which eventually flow out to the sea. 它们最终都流向大海