勉力而為

to try one's best to do sth (idiom)

to exhort / to make an effort

to strive / to make an effort / to exert oneself

power / force / strength / ability / strenuously

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

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