Sports an open, level area marked with appropriate lines, upon which a game, such as tennis, handball, or basketball, is played.

球场：水平开阔的地方，划有适当的线，人们在上面打网球、手球或篮球等游戏。

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An open, level area marked with appropriate lines, upon which a game, such as tennis, handball, or basketball, is played.

球场水平开阔的地方，划有适当的线，人们在上面打网球、手球或篮球等游戏。

youdao

Tennis requires lines and a net and the agreement of its participants to abide by the conceit that those boundaries matter.

NEWYORKER: Master of Play

The virtual Olympic lab will begin testing seven sports, including Athletics, tennis, basketball and triathlon and these seven alone will require half a million lines of code.

BBC: Virtual London 2012 Olympics off starting block