他们租了一些贫瘠的土地，开始种树。

They rented some poor land and began to plant trees.

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贫瘠的土地上首先长满了地衣这种低等植物，它们在裸露的岩石上生存。

First to colonize the barren land are the lowly lichens, surviving on bare rock.

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但只有那些降落在非常有利位置的孢子才能开始新的生活；绝大多数的孢子降落在贫瘠的土地上。

But only those few spores that settle down in very favorable locations can start a new life; the vast majority fall on barren ground.

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