HSK 7-9
戒备
jièbèi动
to take precautions; to guard against (emergency)
巡逻人员夜间保持高度戒备。
Xún luó rén yuán yè jiān bǎo chí gāo dù jiè bèi.
Patrol officers remain on high alert at night.
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Appears across levels (7-9) in the HSK 3.0 word list.