HSK 7-9
警戒
jǐngjiè动
to warn; to alert; to be on the alert; to stand guard
暴雨期间河岸加强警戒。
Bào yǔ qī jiān hé àn jiā qiáng jǐng jiè.
Security along the riverbank was heightened during the heavy rain.
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Appears across levels (7-9) in the HSK 3.0 word list.