中譯英...唔該

I have been working as a librarian during the summer in the community center.

the tense is wrong...it should be "i had worked as" or "i had been employed as" rather than "i have been working"

I once in the community centre library worked as summer labor

I once acted as the worker in summer vacation time in the library of the community centre

I have been a summer worker in the library of a community centre.