each person or thing has their own specific strong points or advantages

to have no special strengths or skills; without any professional qualifications

each shows what they are best at or what they excel in

literally "a foot may be too short, and an inch may be enough"; used to mean that everyone has their own strengths and weaknesses, and everything has its advantages and disadvantages

to fully apply one's strengths or talents; to do one's best with what one is good at. Also written as [[尽其所能|盡其所能|jin4 qi2 suo3 neng2]]

deputy or vice director of an institute, office, or station