不为人知

not known to anyone / secret / unknown

no; not so / (bound form) not; un-

as (in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do / by (in the passive voice)

because of / for / to

variant of 為|为[wei2] / as (i.e. in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do

variant of 為|为[wei4]

variant of 為|为[wei2]

to conduct oneself / behavior / conduct / personal character

for sb / for others' interest

person; people / CL:個|个[ge4],位[wei4]

to know / to be aware