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It's late spring,
时值晚春
and as the mounting strength of the sun warms the land,
日渐炎热的阳光温暖了大地
eight million reindeer move north.
八百万头驯鹿展开了北行的旅程
But the vegetation is so meagre
但是这里的植物少得可怜
that the only way the herds can get enough
驯鹿群得不断迁移
is to keep constantly on the move.
才能填饱肚子
Newborn calves soon discover
新生的小驯鹿很快就发现 它们为了觅食
that they will have to spend every day walking in search of food.
得从早走到晚
They have extraordinary endurance.
驯鹿的耐力惊人
Some of these animals, before they die,
有的驯鹿一辈子走的距离
will have trekked for a distance equivalent to three times around the earth.
可以绕地球三圈
Grazing is now at its best.
现在是青草最丰美的时节
But this also the time when the reindeer' worst enemy appears...
但驯鹿最大的敌人 也在这时候出现
Biting flies.
会叮咬它们的苍蝇
The flies not only drive them to distraction,
这些苍蝇不但烦人
but they can drain a pint of blood each day.
而且一天的吸血量高达半公升
