들면

들면

"들면" means "if/when (someone) lifts or raises" in English.

The word '들면' in this sentence is derived from '들다' meaning 'to pick up' or 'to lift,' combined with the conditional particle '면,' which expresses a conditional meaning 'if.'

책을 들면 쉽게 읽을 수 있어요.

If you pick up the book, you can read it easily.

Here, '들면' from '들다' adjusts meaning to indicate a temporal conditional, referring to 'if night comes' or 'falls.'

밤이 되면 공기가 차가워져요.

If night falls, the air becomes cold.

The term '들면' links the conditional act (opening a door) resulting in the sense of hearing, signifying 'entering a state of perceiving.'

문을 열면 소리가 들려요.

If you open the door, you can hear a sound.