图书标签: 环境
发表于2024-11-25
The Earth As Modified by Human Action pdf epub mobi txt 电子书 下载 2024
There can be no doubt that moisture is given, out by trees and evaporated in extremely cold winter weather, and unless new fluid were supplied from the roots by the exercise of some vital function, the tree would be exhausted of its juices before winter was over. But this is not observed to be the fact, and, though the point is disputed, respectable authorities declare that "wood felled in the depth of winter is the heaviest and fullest of sap."
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The Earth As Modified by Human Action pdf epub mobi txt 电子书 下载 2024