HSK 7-9
察觉
chájué动
to sense; to perceive; to become aware of; to detect
她很快察觉对方语气变化。
Tā hěn kuài chá jué duì fāng yǔ qì biàn huà.
She quickly noticed the change in the other person's tone.
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Appears across levels (7-9) in the HSK 3.0 word list.