警戒

1. warn; admonish

2. be on the alert against; guard against; keep a close watch on

♦ 采取~措施 take precautionary measures

♦ 沿公路放出~ post guards along the highway

♦ ~部队 outpost troops; security force (or detachment)

~色 [动]warning (or aposematic) coloration~水位 warning water level; warning stage

♦ ~线 cordon; security line

~状态 state of alert