뒷자석에서도 꼭 안전벨트를 하세요.

Did you hear about that crash on the highway?
Yeah, someone in the back seat got badly hurt.
I heard they weren't wearing seatbelts.
That's so dangerous even in the back.
I always tell people to buckle up in front or back.

고속도로에서 일어난 충돌 사고에 대해 들었어?
응, 뒷좌석에 있던 누군가가 크게 다쳤다며?
안전벨트를 하지 않고 있었대.
뒷자석에서도 그건 참 위험해.
난 항상 사람들에게 꼭 안전벨트를 하라고 해, 앞뒤 좌석 어디든.

that thing you do
네가 하는 그것
front seat
앞좌석, 보조석, 조수석, 캐주얼하게는 shotgun
driver's seat 운전석
I heard they weren't wearing seat belts.
-> I heard they didn't buckle up/ wear seat belt. 라고 할 수도 있음
Equally dangerous even in the back.
뒷자리도 위험해.
Make sure you wear yourseat belt even in the back.
뒷자석에서도 꼭 안전벨트를 하세요.
I filled the paper in front or back.
종이 한 장을 빽빽하게 썼어.
wear/put on seatbelt
안전벨트를 하다
Always sit in the back seat where it's safe.
항상 안전한 뒷좌석에 앉으세요.