“I remember trying to make my case to the city, and they said, ‘You know, if we just planted four trees, it would cost us a tenth the cost of a green roof, ’” she says.

“我记得当时试着把自己的想法推向这个城市，他们回答说，‘你知道的，我们种四棵树的成本只需建造一个绿色屋顶的十分之一，’”她说。

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Digory now saw that where four trees grew close together their branches had all been laced together or tied together with switches so as to make a sort of cage.

迪格雷这才看见，四棵树紧紧地长在一起，树枝相互缠绕纠结，形成一个像笼子似的东西。

youdao

Digory now saw that where four trees grew close together their branches had all been laced together or tied together with switches so as to make a sort of cage.

迪格雷这才看见，四棵树紧紧地长在一起，树枝相互缠绕纠结，形成一个像笼子似的东西。

youdao