从冰天雪地的冻土地带到热带雨林地区，再到寸草不生的茫茫荒漠，地球上每一个生态环境中都有人类的足迹。
Human beings fill every ecological niche on the planet, from the icy tundra to the tropical rain forests to the deserts.
从冰天雪地的冻土地带到热带雨林地区，再到寸草不生的茫茫荒漠，地球上每一个生态环境中都有人类的足迹。
Human beings fill every ecological niche on the planet, from the icy tundra to the tropical rain forests to the deserts.
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