convenience

n.方便，便利；有益的工具；便利设备；公厕

controversial, controversialist, controversially, controversy, controvert, contumacious, contumaciously, contumacy, contumely, contuse, contusion, conundrum, conurbation, convalesce, convalescence, convalescent, convection, convector, convene, convener (also convenor), convenience food, convenient, conveniently, convent, convention, conventional, conventionality, conventionalize, conventionalize, -ise, conventionally, conventions, converge, convergence, convergent, conversance, conversant, conversation, conversational, conversationalist, converse,