결혼생활을

In a sentence

• 결혼생활을 행복하게 유지하려면 서로 존중이 중요합니다.

  To maintain a happy married life, mutual respect is important.

  The word '결혼생활을' is used to refer to the concept of 'married life' as the subject for maintaining happiness.

• 부부는 결혼생활을 통해 서로 성장할 수 있습니다.

  Couples can grow together through their married life.

  Here, '결혼생활을' represents the medium or experience through which the growth happens.

• 그는 결혼생활을 개선하기 위해 많은 노력을 기울였습니다.

  He made great efforts to improve his married life.

  In this sentence, '결혼생활을' is the object of improvement or focus of the efforts made.