滄 - ocean

great blue sea; ocean

the blue sea; blue waters

the world is a scene of constant changes (as a mulberry field changing into a blue sea)

the world is a scene of constant changes; a mulberry field changes into a blue sea

the world is a scene of constant changes; the blue sea turns into a mulberry field

drop in the bucket; drop in the ocean; one grain of millet in a vast ocean

talented person unbeknownst to the world