准线

【计】 directrix

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directrix

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zhun3 xian4

directrix line of a parabola, guide line

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准线

zhǔn xiàn

neat line （墙面）; {数} directrix; alignment

准线望远镜 alignment telescopes

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準線|准线 [zhǔn xiàn] ► directrix line of a parabola ► guide line