，People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .
量测量中一直以弓高弦长等方法测量非整形圆弧半径值。
bowstring
/'bəʊstrɪŋ/ /'boʊstrɪŋ/
- n. 弓弦
- vt. (用弓弦)勒死, 绞死
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duck-weed, ducky, Ducommun, ducon, duct, duct gland, ductal, Ductalloy, ducted, ducter,
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bowshock, bowshot, bowsman, bowsprit, bowstave, bowstring, bowstring hemp, bow-tie, bow-twixter, bow-wave,