所见所闻 (suǒjiànsuǒwén) means "what one sees and hears," referring to personal observations and experiences. It is a formal four-character expression commonly used when summarizing impressions from a trip, event, or period of time. It uses the classical 所 + Verb structure to nominalize the verbs 见 (see) and 闻 (hear).
他把这次旅行的所见所闻都写在了日记里。
tā bǎ zhè cì lǚxíng de suǒjiànsuǒwén dōu xiě zài le rìjì lǐ.
He wrote down everything he saw and heard on this trip in his diary.
回国后,她跟朋友分享了在非洲的所见所闻。
huíguó hòu, tā gēn péngyou fēnxiǎng le zài fēizhōu de suǒjiànsuǒwén.
After returning to her country, she shared what she saw and heard in Africa with her friends.
这篇文章记录了作者在农村的所见所闻。
zhè piān wénzhāng jìlù le zuòzhě zài nóngcūn de suǒjiànsuǒwén.
This article records what the author saw and heard in the countryside.