懂中文 Dong Chinese
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准线
zhǔn​xiàn

directrix

Definitions Defs Origin Strokes Stroke Words Sentences Sents
准线 (準線) zhǔn​xiàn
directrix
the fixed line used in the definition of a conic section such as a parabola
guide line noun
a reference line used for alignment or as a guide in construction or measurement

Frequency

Movie subtitles
0.030 per million appears in 0% of films
Written text
0.072 per million

Sources

Definitions
CC-CEDICT
Frequency data
SUBTLEX-CHBCC Corpus (BLCU)