嚴格

strict / stringent / tight / rigorous

surname Yan

tight (closely sealed) / stern / strict / rigorous / severe / father

square / frame / rule / (legal) case / style / character / standard / pattern / (grammar) case / (classical) to obstruct / to hinder / (classical) to arrive / to come / (classical) to investigate / to study exhaustively

strictly speaking

strictly speaking

rigorous isolation