circumference

n.圆周，周长

cipher, cipher (also cypher), circa, circle, circlet, circuit, circuit training, circuit-breaker, circuitous, circuitously, circuity, circular, circular saw, circularity, circularize, -ise, circulate, circulation, circulatory, circumcise, circumcision, circumflex, circumlocution, circumlocutory, circumnavigate, circumnavigation, circumscribe, circumscribed, circumscription, circumspect, circumspection, circumspectly, circumstance, circumstantial, circumstantiality, circumstantially, circumvent, circumvention, circus, cistern, citation,