concentrate on

集中注意力于

comrade, comrade-in-arms n (pl comrades-in-arms), comradely, comradeship, con, con man, concatenate, concatenation, concave, concavity, conceal, concealment, concede, conceit, conceited, conceitedly, conceivable, conceivably, conceive, concentrate, concentrated, concentration, concentric, concept, conception, conceptive, conceptual, concern, concerned, concernedly, concerning, concert, concert grand, concert-goer, concert-master, concerted, concertina, concerto, concess, concession,