People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .
在几何量测量中一直以方法测量非整形圆弧半径值。
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Jon notched a fire arrow to his bowstring, and Satin lit it from the torch. He stepped to the parapet, drew, aimed, loosed. Ribbons of flame trailed behind as the shaft sped downward and thudded into its target, crackling.
琼恩沉着地将一支火弓弦,让纱丁用火炬点燃,然后走向城垛,引弓,瞄准,发射。支拖着一束火尾飞速向下,钉入目标之中,发出噼里啪啦的声响。