〔考え〕thought; 〔熟考〕consideration; 〔沈思〕reflection
思案する｜think ((about)); consider; reflect ((on))
I sat at my desk, lost [buried] in thought.
「I pondered [I thought hard, hunting for] a way to get through the crisis.
I can think of no other [better] plan than this.
This calls for careful consideration.／We've got to think this over carefully.
He told his uncle what had (really) happened because he was 「quite at a loss what to do [at his wit's end].
She had a troubled look on her face as she came in.
be at a loss what to do／be at one's wit's end
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