1.a special seat for a baby or young child that can be used in a car 幼儿汽车座椅
2.a seat in a car 汽车座位
Examples from the Corpus
car seat• Officers found used hypodermic needles in a trailer in the backyard next to an infant car seat.• Ensure you use the correct fitting kit for your make and model of car seat.• Miguel stood there by the car seat, thinking about Amelia.• He thought about hiding it in the car seat, but Firebug was always moving the thing around.• Miguel told him, picking a spot opposite the car seat for the desk.