공부중

- on the surface : 표면적으로, 겉으로는

- go wrong : 잘못되다. 고장 나다.

- problematic : 문제가 되는

Doors can be problematic at times.

He is a problematic student.

This might become problematic later.

- have no idea : 전혀 모르다.

- be locked out : 문이 잠겨 들어갈 수 없게 되다.

Were you locked out again?

He was locked out of his car.

- be locked in : 문이 잠겨 나올 수 없게 되다.

- call a locksmith : 열쇠 수리 기사를 부르다.

- electronic door lock : 전자 잠금 장치

- get rid of : 없애다.

He got rid of everything he didn't need.

You should get rid of all your negative thoughts.

Get rid of the unnecessary contents.

- the battery dies : 건전지가 방전되다.

- replace the batteries : 건전지를 교체하다.

You have to replace the batteries in the door lock.

You can't replace the battery on this phone.

If the remote isn't working, try replacing the batteries.

When did you replace the batteries in your remote?

- be reset : 재설정되다.

- easier to solve : 해결하기 쉬운

- squeaky door : 삐걱거리는 문

A squeaky door can be fixed quite easily.

She was woken by the squeaky door.

His voice sounds like a squeaky door.

- squeaky : 삐걱 소리가 나는

- lubricant : 윤활유

- door knob : 문 손잡이

- knob : 손잡이

- know-how : 노하우, 요령

I'll never learn his know-how.

She has a lot of know-how from experience.

- My door got jammed. 문이 걸려서 열리지를 않았어.