묶어야

In a sentence

• 신발끈을 단단히 묶어야 다치지 않아요.

  You need to tie your shoelaces tightly to avoid injury.

  In this sentence, "묶어야" refers to the necessity of tying.

• 행복한 추억들을 사진으로 묶어야 영원히 간직할 수 있어요.

  You need to tie happy memories together with photos to keep them forever.

  Here, "묶어야" metaphorically means to 'connect' or 'bind' memories through photos.

• 두 개의 줄을 하나로 묶어야 강하게 고정됩니다.

  You need to tie two ropes together to secure them strongly.

  In this context, "묶어야" implies combining objects to make them secure.