婚姻 (hūnyīn) means "marriage" or "matrimony" and refers to the institution or state of being married. It is used in formal and general contexts, such as 婚姻生活 (married life) and 提供婚姻咨询 (provide marriage counseling).
他们的婚姻很幸福,已经结婚二十年了。
tāmen de hūnyīn hěn xìngfú, yǐjīng jiéhūn èrshí nián le.
Their marriage is very happy; they've been married for twenty years.
婚姻需要两个人共同经营。
hūnyīn xūyào liǎng gè rén gòngtóng jīngyíng.
Marriage requires both people to work at it together.
现在很多年轻人对婚姻的看法和以前不一样了。
xiànzài hěn duō niánqīngrén duì hūnyīn de kànfǎ hé yǐqián bù yīyàng le.
Nowadays many young people have different views on marriage than before.