on alert
英
美
警戒, 随时准备着
on alert的用法和样例：
词汇搭配
on the alert
注意
put on the alert
处于戒备状态...
on alert的相关资料：
临近单词
on.
on
On the island without name.
on line information retrieval
ON WELL-MOTIVATED INFERENCE
on- line teaching resources
On the precipice of defeat.
On the Guide's Written Speech
on one's individual judgement
On Chinese Loanwords in Uigur
on-campus mental counseling
on-load capacity regulating
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