老司機

(coll.) an old hand at sth

prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity / old (of people) / venerable (person) / experienced / of long standing / always / all the time / of the past / very / outdated / (of meat etc) tough

surname Si

to take charge of / to manage / department (under a ministry)

chauffeur / driver / CL:個|个[ge4]

(bound form) machine; mechanism / (bound form) aircraft / (bound form) an opportunity / (bound form) crucial point; pivot / (bound form) quick-witted; flexible / (bound form) organic