日積月累

to accumulate over a long period of time

moon / month / monthly / CL:個|个[ge4],輪|轮[lun2]

abbr. for 日本[Ri4 ben3], Japan

sun / day / date, day of the month

to accumulate / to involve or implicate (Taiwan pr. [lei4]) / continuous / repeated

tired / weary / to strain / to wear out / to work hard

surname Lei

rope / to bind together / to twist around

to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing