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定直线
定直線
dìngzhíxiàn
1. directrix of a parabola

Character Breakdown

定
dìng
to decide, to fix, to settle; to order; definite, fixed, sure
HSK 3 8 丶
直
zhí
straight, vertical; candid, direct, frank
HSK 3 8 丶
线
xiàn
line, thread, wire; clue, trail
HSK 4 8 丶

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Chinese