zhong as if lost in a thick fog; be all at sea; be completely at a loss;be enveloped in clouded (/ill-understood) ideas (/problems); be shrouded (/veiled/wrapped) in mystery; be tossed on an ocean of doubts; be utterly mystified ❍ 听了他的讲话，我～。I was all at sea on hearing his talk.
如堕五里雾中ru duo wu li wu zhong
as if lost in a thick fog
如堕五里雾中rú duò wǔ lǐ wù zhōnɡ
堕：落、掉。像掉在很大的烟雾中。比喻迷失方向、摸不清头脑。as if lost in a thick fog, utterly mystified, be tossed on an ocean of doubts