答：網球場是(shi)一(yi)塊由邊(bian)(bian)線(xian)(xian)(xian)、端(duan)線(xian)(xian)(xian)、中(zhong)(zhong)線(xian)(xian)(xian)、發(fa)球(qiu)(qiu)(qiu)(qiu)線(xian)(xian)(xian)和中(zhong)(zhong)點(dian)組(zu)成(cheng)的(de)(de)長(chang)(chang)(chang)(chang)方形(xing)的(de)(de)場(chang)地(di)。球(qiu)(qiu)(qiu)(qiu)場(chang)兩(liang)邊(bian)(bian)的(de)(de)界(jie)線(xian)(xian)(xian)叫(jiao)邊(bian)(bian)線(xian)(xian)(xian)，邊(bian)(bian)線(xian)(xian)(xian)長(chang)(chang)(chang)(chang)23.77米(mi)(78英(ying)尺(chi))。在(zai)距球(qiu)(qiu)(qiu)(qiu)網(wang)兩(liang)側(ce)6.40米(mi)(21英(ying)尺(chi))長(chang)(chang)(chang)(chang)的(de)(de)四條(tiao)單(dan)(dan)打(da)邊(bian)(bian)線(xian)(xian)(xian)除(chu)起著(zhu)判定(ding)單(dan)(dan)打(da)擊。球(qiu)(qiu)(qiu)(qiu)是(shi)否(fou)(fou)出(chu)界(jie)(邊(bian)(bian)線(xian)(xian)(xian)出(chu)界(jie))的(de)(de)作用外(wai)，還(huan)起著(zhu)判定(ding)發(fa)球(qiu)(qiu)(qiu)(qiu)是(shi)否(fou)(fou)界(jie)外(wai)(發(fa)球(qiu)(qiu)(qiu)(qiu)邊(bian)(bian)線(xian)(xian)(xian)出(chu)界(jie))的(de)(de)作用。球(qiu)(qiu)(qiu)(qiu)場(chang)兩(liang)端(duan)的(de)(de)界(jie)線(xian)(xian)(xian)叫(jiao)端(duan)線(xian)(xian)(xian)。單(dan)(dan)打(da)端(duan)線(xian)(xian)(xian)長(chang)(chang)(chang)(chang)8.23米(mi)(27英(ying)尺(chi))(圖(tu)1)。雙打(da)端(duan)線(xian)(xian)(xian)長(chang)(chang)(chang)(chang)10.97米(mi)(36英(ying)尺(chi))(圖(tu)2)，比單(dan)(dan)打(da)場(chang)地(di)海邊(bian)(bian)多1.37米(mi)(4 1/2英(ying)尺(chi))。端(duan)線(xian)(xian)(xian)除(chu)起著(zhu)判定(ding)擊球(qiu)(qiu)(qiu)(qiu)是(shi)否(fou)(fou)界(jie)外(wai)(端(duan)線(xian)(xian)(xian)出(chu)界(jie))的(de)(de)作用外(wai)，還(huan)起著(zhu)判定(ding)發(fa)球(qiu)(qiu)(qiu)(qiu)員發(fa)球(qiu)(qiu)(qiu)(qiu)時(shi)是(shi)否(fou)(fou)踏線(xian)(xian)(xian)違例(腳誤)的(de)(de)作用。在(zai)球(qiu)(qiu)(qiu)(qiu)網(wang)兩(liang)側(ce)6.40米(mi)(2l英(ying)尺(chi))處的(de)(de)場(chang)內(單(dan)(dan)打(da)球(qiu)(qiu)(qiu)(qiu)場(chang)場(chang)內)各畫(hua)(hua)一(yi)條(tiao)與(yu)球(qiu)(qiu)(qiu)(qiu)網(wang)平行(xing)的(de)(de)橫線(xian)(xian)(xian)叫(jiao)做發(fa)球(qiu)(qiu)(qiu)(qiu)線(xian)(xian)(xian)。聯結兩(liang)發(fa)球(qiu)(qiu)(qiu)(qiu)線(xian)(xian)(xian)的(de)(de)中(zhong)(zhong)點(dian)，畫(hua)(hua)一(yi)條(tiao)與(yu)邊(bian)(bian)線(xian)(xian)(xian)平行(xing)的(de)(de)線(xian)(xian)(xian)叫(jiao)做中(zhong)(zhong)線(xian)(xian)(xian)，中(zhong)(zhong)線(xian)(xian)(xian)與(yu)球(qiu)(qiu)(qiu)(qiu)網(wang)成(cheng)“十”字形(xing)，將(jiang)發(fa)球(qiu)(qiu)(qiu)(qiu)線(xian)(xian)(xian)與(yu)邊(bian)(bian)線(xian)(xian)(xian)間的(de)(de)地(di)面分(fen)成(cheng)四個(ge)相(xiang)等的(de)(de)區(qu)(qu)域(yu)，這個(ge)區(qu)(qu)域(yu)叫(jiao)做發(fa)球(qiu)(qiu)(qiu)(qiu)區(qu)(qu)。發(fa)球(qiu)(qiu)(qiu)(qiu)員只有將(jiang)球(qiu)(qiu)(qiu)(qiu)發(fa)在(zai)規定(ding)的(de)(de)發(fa)球(qiu)(qiu)(qiu)(qiu)區(qu)(qu)內才算(suan)合法發(fa)球(qiu)(qiu)(qiu)(qiu)。在(zai)端(duan)線(xian)(xian)(xian)的(de)(de)中(zhong)(zhong)心，向場(chang)內畫(hua)(hua)一(yi)條(tiao)10厘米(mi)(4英(ying)寸(cun))長(chang)(chang)(chang)(chang)、5厘米(mi)(2英(ying)寸(cun))寬的(de)(de)垂(chui)直于端(duan)線(xian)(xian)(xian)的(de)(de)短線(xian)(xian)(xian)叫(jiao)做中(zhong)(zhong)點(dian)。中(zhong)(zhong)點(dian)將(jiang)端(duan)線(xian)(xian)(xian)分(fen)成(cheng)相(xiang)等的(de)(de)兩(liang)部分(fen)。中(zhong)(zhong)點(dian)限(xian)制著(zhu)發(fa)球(qiu)(qiu)(qiu)(qiu)員發(fa)球(qiu)(qiu)(qiu)(qiu)時(shi)的(de)(de)站位。