To stir up waves in the East China Sea to fill his cup is to stir up waves in the East China Sea to fill his cup. Yang refers to nourishment, the East China Sea refers to the eastern sea, waves refer to water waves, waves, used in this sentence, note refers to irrigation, refers to him and them, and cups refer to cups. "Lift the waves of the East China Sea to fill its cup" means to lift the waves of the East China Sea to fill his cup, which means to fill the overflowing part of the East China Sea with a small cup, which is synonymous with cutting feet and fitting shoes.