four-lens zoom system
四透镜变焦系统

• camera speed
• camera tube
• camera tubes
• camera tube target
• cam follower
• camming surface
• cammouflage-detectin film
• camphor
• campimeter
• campimetry, perimetry
• cam-plate
• camshaft tester
• can
• Canada balsam
• canal
• canal ray
• canal ry
• cancellation
• cancellation amplifier
• canceller
• candela 1
• candescence
• candle
• candle power
• candles per unit area