back court boundary 中文意思是什麼
back court boundary
解釋
端線-
Extension of the court by l 1 2 feet on both sides for doubles play. area between the back boundary line and the long service line for doubles
單打與雙打界線間空地網球場邊的平行狹長地帶,加寬了界內場地,可進行雙打比賽
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