HSK 7-9
脑海
nǎohǎi名
the mind; the brain
那段旋律一直留在我脑海里。
Nàduàn xuánlǜ yìzhí liúzài wǒ nǎohǎi lǐ.
That melody has stayed in my mind.
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Appears across levels (7-9) in the HSK 3.0 word list.