遗精的发病机制，主要是(  )。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25922' and id < 2175902 and id<>'2175902' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25922' and id > 2175902 and id<>'2175902' order by id asc limit 5