小事一桩

trivial matter / a piece of cake

small / tiny / few / young

trifle / trivial matter / CL:點|点[dian3]

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

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

stump / stake / pile / classifier for items