Without trees, many animals can not live on the earth. It's not easy for man to live on the earth, either.
没有树木，许多动物不能在地球上生活，人类在地球上生活也不容易。
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"When I planted the fern and bamboo seeds, I took very good care of them. Within a short period of time, the fern quickly grew from the earth," the old man went on.