他们使山艾树的数目受到控制。
在没有加热的自然区域，山艾树是很多昆虫的水源。
In the unheated natural area, sagebrush is a source an army of thirsty insects.
虽然这样对山艾树比较好，但是对邻近的植物造成威胁。
While that's good for sagebrush; it's not good for its plant neighbors.
虽然这样对山艾树比较好，但是对邻近的植物造成威胁。
While that's good for the sagebrush; it's not good for its plant neighbors.
虽然这样对山艾树比较好，但是对邻近的植物造成威胁。
While that's good for the sagebrush; it's not good for its plant neighbors.
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