A large number of books

countless/innumerable

Work as skillfully as a skilled butcher cuts the carcass of a cow-do sth very skillfully/professionally.

(of China's calligraphy) lively and powerful.

Put the dragon in the painting into the pupil of its eyes to make it lifelike ―― adding vitality to the works of art.

Old and stupid

Pretend to love what you are actually afraid of.

Talk like a waterfall

Words flow from the mouth as if they were written by a master.

Be sincerely/completely persuaded

In everyone's mouth.