Read Edit View history 投影线 tóuyǐngxiàn projection line Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 投影线/投影線 · tóuyǐngxiàn · projection line 2026/03/04 投影线 / 投影線 tóuyǐngxiàn projection line A line used in geometry or technical drawing to project a point onto a plane or surface. 在工程制图中，投影线必须严格保持平行。 noun created sense Mar 4, 2026, 02:25 AM