Sitting under the tree was a charming girl aged about seventeen or eighteen.
坐在树下的是一位年约十七八岁的可爱女孩。
It started off as a regular tree, but as it aged, its branches bent so low to the ground that they started to take root as well.
它原本是棵普通的树，年复一年，枝条却渐渐低垂，扎根在了土中。
A transfering probability matrix model of linearly generalized diameter growth was used to deal with the tree species composition problem of mixed unevenly aged forest.
对直径生长转移概率矩阵模型进行了线性扩展，用以研究混交异龄林的树种组成问题。
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