食道癌中下段等中心定位时，把模拟中心放在肿瘤中心，照射野一般在肿瘤上下各放多长

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29515' and id < 2400774 and id<>'2400774' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29515' and id > 2400774 and id<>'2400774' order by id asc limit 5