tram·lines
noun/ˈtræmlaɪnz/
/ˈtræmlaɪnz/
[plural]- the rails in the street that trams run on
电车轨道 - (British English, informal) the pair of straight lines on a tennis or badminton court that mark the extra area that is used when four people are playing
（网球或羽毛球球场两侧的）双打边线