Now they turn, blasting air from their blowholes, and ascend towards their prey. 现在座头鲸转身 利用呼吸孔吐气 喷向猎物
Antarctic petrels now join the most southerly bird colony on Earth. 南极雪海燕的领地在地球的最南方
but when the conditions are right as now 但如果条件允许 譬如现在
But for a while the hunting will be easier, now that river channel has turned green. 此时 狩猎暂时变得容易许多 河道也穿上了一件绿装
and now it's time to find some food. 现在该是寻找食物的时候了
until now the land between them has been reduced to spires and pinnacles. 直到把其间的土地削凿成 今天这样的尖峰和石塔
is now crucial to most of the animals that live or even travel through this land. 如今已关系到大部分 在此生活和旅行的动物
so it's only now that you can judge just how much life there can be in the desert. 所以只有此时你才能判断 沙漠中究竟有多少生物
It's only now that they can leave shelter. 所以只有到了晚上它们才能离开庇护所