密度是由树木的生长方式决定的。
他们提议，在英国建造城镇之前生长的树木和植物应当被允许重新种植。
They suggest that trees and plants that grew in the UK before towns and cities were built should be allowed to grow again.
在亚马逊流域，有无数的狩猎采集者，他们生活在世界上最大的沿河生长的树木的枝干上。
There are numberless hunter-gatherers in Amazonia, living along branches of the world's largest river tree.
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