Using these formulas, the ulterior ballistic performance variation of the gun in different wearing degree can be predicted by measuring the land diameter wear figure.

应用这些公式，可通过静态测量火炮内径改变量的方法确定不同磨损程度火炮的内弹道性能变化。

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Even though Mars has almost the same land surface area as Earth, it has only half the diameter and less density than Earth - possessing roughly 15% of Earth's volume and 11% of its mass.

虽然火星的表面积相当于地球的陆地面积，但是它的直径只有地球的一半，密度也小于地球，只有地球体积的15%，地球质量的11%。

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Floated, about a foot in diameter, and within it showed a tableau of a land with blue sky and green fields.

它在空中漂浮，直径大约一码，里面展示着一片充满生机的世界——碧蓝的天空、翠绿的大地。

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Traversing their land is a natural gas pipeline, 36 inches in diameter and 6 feet underground.

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He plans to put the storage bags through smaller scale land-based tests, with four-meter-diameter bags, to prove that his calculations are right.

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