答：網球場是(shi)(shi)(shi)一(yi)(yi)塊由邊(bian)線(xian)(xian)、端(duan)線(xian)(xian)、中(zhong)(zhong)(zhong)線(xian)(xian)、發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)線(xian)(xian)和(he)中(zhong)(zhong)(zhong)點(dian)組成(cheng)的(de)(de)(de)(de)(de)(de)長(chang)方形(xing)的(de)(de)(de)(de)(de)(de)場(chang)地(di)。球(qiu)(qiu)(qiu)(qiu)(qiu)場(chang)兩邊(bian)的(de)(de)(de)(de)(de)(de)界(jie)(jie)(jie)線(xian)(xian)叫邊(bian)線(xian)(xian)，邊(bian)線(xian)(xian)長(chang)23.77米(mi)(78英(ying)(ying)尺(chi)(chi))。在(zai)距球(qiu)(qiu)(qiu)(qiu)(qiu)網(wang)兩側6.40米(mi)(21英(ying)(ying)尺(chi)(chi))長(chang)的(de)(de)(de)(de)(de)(de)四(si)條單(dan)打邊(bian)線(xian)(xian)除起(qi)(qi)著(zhu)判(pan)定(ding)(ding)單(dan)打擊。球(qiu)(qiu)(qiu)(qiu)(qiu)是(shi)(shi)(shi)否(fou)出(chu)(chu)界(jie)(jie)(jie)(邊(bian)線(xian)(xian)出(chu)(chu)界(jie)(jie)(jie))的(de)(de)(de)(de)(de)(de)作(zuo)用外，還(huan)起(qi)(qi)著(zhu)判(pan)定(ding)(ding)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)是(shi)(shi)(shi)否(fou)界(jie)(jie)(jie)外(發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)邊(bian)線(xian)(xian)出(chu)(chu)界(jie)(jie)(jie))的(de)(de)(de)(de)(de)(de)作(zuo)用。球(qiu)(qiu)(qiu)(qiu)(qiu)場(chang)兩端(duan)的(de)(de)(de)(de)(de)(de)界(jie)(jie)(jie)線(xian)(xian)叫端(duan)線(xian)(xian)。單(dan)打端(duan)線(xian)(xian)長(chang)8.23米(mi)(27英(ying)(ying)尺(chi)(chi))(圖1)。雙打端(duan)線(xian)(xian)長(chang)10.97米(mi)(36英(ying)(ying)尺(chi)(chi))(圖2)，比單(dan)打場(chang)地(di)海邊(bian)多(duo)1.37米(mi)(4 1/2英(ying)(ying)尺(chi)(chi))。端(duan)線(xian)(xian)除起(qi)(qi)著(zhu)判(pan)定(ding)(ding)擊球(qiu)(qiu)(qiu)(qiu)(qiu)是(shi)(shi)(shi)否(fou)界(jie)(jie)(jie)外(端(duan)線(xian)(xian)出(chu)(chu)界(jie)(jie)(jie))的(de)(de)(de)(de)(de)(de)作(zuo)用外，還(huan)起(qi)(qi)著(zhu)判(pan)定(ding)(ding)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)員(yuan)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)時是(shi)(shi)(shi)否(fou)踏線(xian)(xian)違(wei)例(li)(腳誤)的(de)(de)(de)(de)(de)(de)作(zuo)用。在(zai)球(qiu)(qiu)(qiu)(qiu)(qiu)網(wang)兩側6.40米(mi)(2l英(ying)(ying)尺(chi)(chi))處的(de)(de)(de)(de)(de)(de)場(chang)內(nei)(nei)(單(dan)打球(qiu)(qiu)(qiu)(qiu)(qiu)場(chang)場(chang)內(nei)(nei))各畫(hua)一(yi)(yi)條與(yu)球(qiu)(qiu)(qiu)(qiu)(qiu)網(wang)平(ping)行(xing)的(de)(de)(de)(de)(de)(de)橫線(xian)(xian)叫做(zuo)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)線(xian)(xian)。聯結兩發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)線(xian)(xian)的(de)(de)(de)(de)(de)(de)中(zhong)(zhong)(zhong)點(dian)，畫(hua)一(yi)(yi)條與(yu)邊(bian)線(xian)(xian)平(ping)行(xing)的(de)(de)(de)(de)(de)(de)線(xian)(xian)叫做(zuo)中(zhong)(zhong)(zhong)線(xian)(xian)，中(zhong)(zhong)(zhong)線(xian)(xian)與(yu)球(qiu)(qiu)(qiu)(qiu)(qiu)網(wang)成(cheng)“十”字形(xing)，將發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)線(xian)(xian)與(yu)邊(bian)線(xian)(xian)間的(de)(de)(de)(de)(de)(de)地(di)面分(fen)成(cheng)四(si)個相(xiang)等的(de)(de)(de)(de)(de)(de)區(qu)(qu)域，這個區(qu)(qu)域叫做(zuo)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)區(qu)(qu)。發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)員(yuan)只有將球(qiu)(qiu)(qiu)(qiu)(qiu)發(fa)在(zai)規(gui)定(ding)(ding)的(de)(de)(de)(de)(de)(de)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)區(qu)(qu)內(nei)(nei)才算合法發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)。在(zai)端(duan)線(xian)(xian)的(de)(de)(de)(de)(de)(de)中(zhong)(zhong)(zhong)心，向(xiang)場(chang)內(nei)(nei)畫(hua)一(yi)(yi)條10厘(li)米(mi)(4英(ying)(ying)寸(cun))長(chang)、5厘(li)米(mi)(2英(ying)(ying)寸(cun))寬的(de)(de)(de)(de)(de)(de)垂(chui)直于(yu)端(duan)線(xian)(xian)的(de)(de)(de)(de)(de)(de)短線(xian)(xian)叫做(zuo)中(zhong)(zhong)(zhong)點(dian)。中(zhong)(zhong)(zhong)點(dian)將端(duan)線(xian)(xian)分(fen)成(cheng)相(xiang)等的(de)(de)(de)(de)(de)(de)兩部分(fen)。中(zhong)(zhong)(zhong)點(dian)限制著(zhu)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)員(yuan)發(fa)球(qiu)(qiu)(qiu)(qiu)(qiu)時的(de)(de)(de)(de)(de)(de)站位。