HSK 7-9
交集
jiāojí动
(of diverse emotions) to occur simultaneously; to intermingle; common ground; points of commonality; overlap; connection; interaction; dealings; (math.) (set theory) intersection
两个研究领域存在不少交集。
Liǎng gè yán jiū lǐng yù cún zài bù shǎo jiāo jí.
The two research fields have considerable overlap.
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Appears across levels (7-9) in the HSK 3.0 word list.