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 the yarn approx. 1 "longer than the diameter of your circle backer."

将毛线剪为比圆直径约长1英寸的线段。

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The diameter of a sphere is four times the focal length of a concave mirror cut from it.

凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。

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Monster drills would cut a hole a yard or so in diameter down 2.5 miles into the Earth's crust, past the deepest groundwater into granite rock formations that have sat undisturbed for billions of years.

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Using a paring knife, cut the dough into a circle that is 1 inch larger than the diameter of the pan you're using.

NPR: Cookbook Author Celebrates Apple Season

The company, under its Tapcon brand, began marketing large-diameter concrete screws with tiny, arrowhead-shape chisels wrapped around the screw, to cut into concrete like sharks' teeth.

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