人生 rénshēng life (one's time on earth)

怎么记住“人生”: 人 person + 生 life = life (one's time on earth).

汉字

人生 (rénshēng) means 'life' in the philosophical/existential sense - one's journey and experience of living - as opposed to 生命 (shēngmìng), which means biological life itself (the state of being alive).
Common reflective phrases: 人生的意义 (rénshēng de yìyì) - the meaning of life; 人生道路 (rénshēng dàolù) - one's path in life.
It has a slightly literary, contemplative register - used in essays, songs, and heartfelt conversation, less in mundane small talk.
Compare 一生 (yìshēng, one's whole life span as a unit of time) - 人生 is more about the experience and meaning of living, 一生 more about the duration from birth to death.