will increase the chances of survival for those that live here. 为生活在这里的动物们带来了生机
this strategy would not be enough for survival. 光凭这些手段还不足以在此生存
if they tire of tree bark and other survival food 如果它们厌倦了树皮和其它残存的食物
and can make all the difference in a bear's annual struggle for survival. 直接关系到灰熊每年冬天的生存能力
She has just one brief summer in which to teach them their mountain survival techniques. 母狮只能利用这个短暂的夏天 教会小狮在山区生存的技能
The future of an entire species hangs on survival of a tiny number of mothers like this one. 整个物种的未来寄托在为数不多的几只母豹身上 就好比这一只