I usually only use layers to quickly turn off and on large group items to test out different scenarios or to temporarily turn off poly heavy objects such as trees while I model.
我通常只使用图层来快速打开和关闭大组件项目，以测试不同的场景或暂时关闭面多的项目，比如模型中的树木。
Tree populations in the wild usually satisfy those criteria, but research centers would simply not have enough capacity to keep a large and diverse population of Torreya trees.
在野外生长的树木一般可以满足这些要求，但是研究中心没有能力保护数量足够多，基因足够多样化的香榧树。
Wild populations of trees usually carry a large "genetic load ".
树木的野生群体往往具有大量的“遗传负荷。”
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