吃透英语课本，提升在校竞争力
adj. 警觉的；警惕的
v. （使）警惕；（使）戒备
n. 警报
现在分词：alerting
第三人称单数：alerts
过去式：alerted
过去分词：alerted
复数：alerts
名词：alertness
Taking notes is one of the best ways to stay alert in lectures.
记笔记是听课时集中注意力的最佳方法之一。
The school immediately alerted the police .
学校立即报了警。
Jack was as mentally alert as a man half his age.
杰克的头脑和年龄小他一半的人一样灵活。
The animal raised its head, suddenly alert.
那只动物突然警觉地抬起头来。
campaigns to alert the public to the dangers of HIV
让公众意识到艾滋病病毒危险的宣传活动
alert someone to sth
使...警觉；使...警惕
on the alert
提防；警戒著；随时准备著
red alert
紧急警报，红色警报；应急状况
adj.[军]警惕的，警觉的；留心的
vigilant
precautious
vt.警告；使警觉，使意识到
alarm
warn
n.[军]警戒，警惕；警报
guard
vigilance
1 ...if the left hemisphere was staying alert to keep guard in a strange environment...
2017.12 CET4 阅读理解
2 ...smoking cigarettes and skipping school--can alert parents and teachers that serious problems are brewing...
2016.12 CET6 阅读理解
3 ...Half of your brain stays alert and prepared for danger when you sleep in a new place...
2017.6 CET6 阅读理解
4 ...but instead will alert their friends...
2008.12 CET4 阅读理解
