tramlines
noun [ plural ] uk/ˈtræm.laɪnz/ us/ˈtræm.laɪnz/
(TRACK)
有轨电车轨道
two metal tracks set in the road, along which a tram goes
(SPORT)
UK（网球和羽毛球）球场两侧的加线
two parallel painted lines along the edge of the playing area used in tennis and badminton
In doubles, the ball is not out if it lands between the tramlines. 双打时，球落在球场两侧的加线间不算出界。