动作技能练习到一定阶段时，会出现进步暂时停止或下降难以有所提高的现象是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='23639' and id < 2056526 and id<>'2056526' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='23639' and id > 2056526 and id<>'2056526' order by id asc limit 5