Among the 41 ones there are 3 evergreen species, 24 broad leave tree species, 14 shrubs; 14 of them from local species, 3/4 from outside areas.
骨干树种中有常绿树种3种（乔木1种）、落叶乔木24种、落叶灌木14种，属于乡土树种的14种，外引树种占其3/4。
It's a solution for us—getting birds to do the work is cheap and effective—and it could give vulnerable oaks and pines the option to truly "make like a tree and leave."
这对我们来说是一个解决方案——让鸟类来做这项工作既便宜又有效——它可以让脆弱的橡树和松树有机会真正“像树一样生长，然后老去”。
As I said in my previous article, one huge advantage of shadow trees for the rendering of custom elements is that they leave a healthy and un-cluttered document tree.
我在以前的文章中曾经提到，影像树对于呈现定制元素的巨大好处是它保留了一个健康的、井井有条的文档树。
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