but it has to happen if the forest is to remain healthy. 但若保持雨林的健康这种事情必须要发生.
But the mother has given her cubs the best possible start in life. 但是母亲已经给了它们一个最好的开端
For the foxes, boom time has come to an end. 对于狐狸来说 美好时光已经接近尾声
She has seven hungry cubs to feed. 这只母狐狸有七只饥饿的小狐狸要喂养
A wolf has finally picked up the trail. 一头狼终于找到了猎物的痕迹
and grass that has lain dormant and frozen throughout the winter sprouts once more. 又开始发芽
has prepared them for life at the pole, 它们已经学会怎样生存在极地