- base (topology)
- 基: base; foundation
- 拓: open up; develop; expand
- 拓: 拓動詞(把碑刻、銅器等的形狀和上面的文字、圖形印下來; 拓印) make rubbings from inscriptions, pictures, etc. on stone tablets or bronze vessels
- 【拓】上積。: cup product
- 函 (拓): continuous function (topology)
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