- until the summer ends and they're forced to head south for the winter.
直到夏天结束 它们才会被迫南迁过冬 - At these latitudes, the sun's rays are weak
在这样的高纬度 阳光的强度非常微弱 - and grass can only grow here for a few months a year.
这里的草儿只有几个月的生长期 - But further south, summers are longer and the grasslands flourish.
但是在更远的南边 夏天的时间更长,草原更加茂盛 - The prairies of North America.
北美大草原 - This rich pasture once supported the greatest herds ever seen on our planet.
这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落 - There were once 60 million bison,
这里曾有六千万只北美野牛
But further south, summers are longer and the grasslands flourish. 但是在更远的南边 夏天的时间更长,草原更加茂盛
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