concern

n.所关切的事；关心 vt.与…有关；使担心

concave, concavity, conceal, concealment, concede, conceit, conceited, conceitedly, conceivable, conceivably, conceive, concentrate, concentrate on, concentrated, concentration, concentric, concept, conception, conceptive, conceptual, concerned, concernedly, concerning, concert, concert grand, concert-goer, concert-master, concerted, concertina, concerto, concess, concession, concessionaire, concessionary, concessive, conch, conchology, conciliate, conciliation, conciliatory,