to sink
consider
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→chen2si1 • chénsī
contemplate
ponder, contemplation, contemplating
他 正在 沉思 該 做 什麼。
He's contemplating what he should do.
他 陷入 沉思 之 中。
He is lost in contemplation.
我 經常 沉思 漢字。
I often contemplate Chinese characters.