Lǎoxiānsheng duānzuò yú shūfáng, shǒu pěng yí juǎn gǔshū.
The old gentleman sat upright in his study, holding an ancient book.
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端坐 is more formal or literary than simply 坐 (to sit). It implies sitting with proper posture and dignity, often used in formal, ceremonial, or respectful contexts.
