You know, your traditional, average tree.

你知道，你们传统的，普通的树。

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Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.

引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。

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The succession of plant populations to primary stands may described by "decrease rate of tree number"divided by 1~10 years old of the "average tree age".

能够进入初始林分的“苗木群体” ，可由“平均苗龄” 1～ 10年刻划的“苗木株数递减率”来描述。

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The first step is figuring out how much sap can be extracted from the average birch tree in the Northeast using modern practices, she said.

WSJ: Birch syrup explored as add-on to maple industry

Developers are clearing an average of 50 acres of tree-covered land per day, which amounts to an area larger than Manhattan each year.

CNN: Atlanta

Tests running at two big sawmills, in Europe and in America, suggest that the improvement in yield can run from 2% to 18% for different kinds of tree, with an average gain of 10% in the value of the timber produced from a log.

ECONOMIST: Chopping wood