a complicated matter likely to prove awkward or embarrassing
复杂难解决的事；棘手的事
to question the traditional model of education &B{opens up} too big &B{a can of worms}.
质疑传统教育模式会引起一场轩然大波。
(informal)on tape or film and ready to be broadcast or released
(非正式)（磁带）录制好的，（电影）拍摄好的，准备播放（或发行）的