intrauterine device宫内避孕器

避孕器具。多为塑料或金属制品。由医生放入子宫，用来阻止卵子受精。

• circulatory system
• circum
• circumagitate
• circumcision
• circumference
• circumscribe
• circumscription
• circumspect
• circumstance
• circumstanced
• circumstances
• circumstantial
• circumstantiality
• circumvent
• circus
• circus maximus
• cirencester
• cire perdue
• cirque
• cirque(或corrie)
• cirrhosis
• cirripedia
• cirrocumulus cloud
• cirrostratus cloud
• cirrus cloud