Cut a 70-degree notchinto 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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By tweaking these factors a notch—for instance, by pouring a bit more wine into a glass or shaking that glass in tighter circles—Reclari and colleagues mastered the art of unusual wine waves.