- 中线: central line; median centre ...
- 段: section; segment; part; para ...
- 线段: [数学] segment; line segment
- 中线: 1.[数学] central line; median2.(篮、排球场的) centre line3.(足球场的) halfway line4.[电学] neutral conductor; neutral line; neutral
- 主线段, 干线段: main section
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