木材的立方单位，等于厚一英寸，面积为一平方英尺的木材。
A unit of cubic measure for lumber, equal to one foot square by one inch thick.
由于我将立方体的中心点放在坐标系原点位置处，因此立方体的各边长应为 2 个单位。
Remember that I placed the cube's center at the coordinate system's origin; therefore, the cube's edges will be two units long.
典型的单位是挖方或混凝土工程的立方码和布局钢的吨位。
Typical units are cubic yards for excavation or concrete work and tons for structural steel.
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