Cut a 70-degree notch into the tree with a length of 80 percent of the trunk’s diameter.

在树根处砍一个缺口，缺口的深度应该是树木直径的80%，其角度大约为70度。

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Cut a 70-degree notch into the tree with a length of 80 percent of the trunk’s diameter.

在树根处砍一个缺口，缺口的深度应该是树木直径的80%，其角度大约为70度。

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