HSK 7-9
注
zhù动名
(bound form) to pour into; to flow into; to inject; (bound form) to focus (one's spirit, gaze etc) on a single point; to concentrate; (bound form) stake (in gambling); classifier for stakes, sums of money, transactions or beams of light
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Appears across levels (7-9) in the HSK 3.0 word list.