HSK 7-9
沉思
chénsī动
to contemplate; to ponder; contemplation; meditation
他看完来信后陷入沉思。
Tā kàn wán lái xìn hòu xiàn rù chén sī.
He fell into deep thought after reading the letter.
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Appears across levels (7-9) in the HSK 3.0 word list.