HSK 7-9
监视
jiānshì动
to monitor; to keep a close watch over; surveillance
警方秘密监视可疑车辆。
Jǐng fāng mì mì jiān shì kě yí chē liàng.
The police secretly monitored the suspicious vehicle.
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Appears across levels (7-9) in the HSK 3.0 word list.