Ancient Chinese classics are so extensive that one can scarcely read them all.
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Literary register, mostly used for collections of writing, knowledge, or material — 典籍浩博 (classics are vast), 学识浩博 (learning is vast). For everyday 'plentiful' use 丰富 (fēngfù); for vast scenery use 浩瀚 (hàohàn).
