Caribou females have journeyed to the far north 雌性北美驯鹿远赴北方

278. depends on the turn of the seasons.
     都依赖于季节的更迭
279. Five hundred miles further north than any tree can survive,
     在树木生存极限八百公里以北的地方
280. grass returns to life.
     青草春风吹又生
281. Caribou females have journeyed to the far north
     雌性北美驯鹿远赴北方
282. to calve.
     来此产仔
283. Over 70,000 caribou babies
     超过七万只驯鹿幼崽
284. will be born in the next few days.
     将在几天内出生

来自《行星地球 第二季 第五集 Planet Earth S02E05 草原》第 281 行