1. Can you put luggage in the back seat of a car in the United States?2. All child restraints should be installed in the rear seat of the car.3. My baby son always sits in the back of the car.
 the back seat of the car the rear seat of the car the back of the car有些人會說 back passenger seat，但事實上 passenger 不需要，也可說 I sit in the back of the car, seat 可省略。