沧海一粟

a drop in the ocean (idiom)

blue-green or azure (of water) / vast (of water) / cold

surname Hai

ocean / sea / CL:個|个[ge4],片[pian4] / great number of people or things / (dialect) numerous

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

surname Su

grain / millet / goose bumps