【机械工程】活门，阀门，自动的【机械工程】圆盘阀，自动

slipped disc

cupdisc ratio, C/D

prolapse of lumbar intervertebral disc

compact disc (CD)

segmental abrasive disc grinding with the cylindrical surface

CD writer; disc-carving machine

intervertebral disc

pattern disc, cardboard mount for yarn samples