知识的理解是通过对教材的（ ）实现的。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='23638' and id < 2056477 and id<>'2056477' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='23638' and id > 2056477 and id<>'2056477' order by id asc limit 5