watchful

The entrances are guarded by watchful security staff..入口处由警惕的保安人员把守。

His eyes were watchful..他目光警惕。

真题例句...children who are watchful will be better able to stay away from Unsafe situations...CET62009.6阅读理解

真题例句...and how to avoid unsafe situations by being watchful and on their toes...CET62009.6阅读理解

真题例句...Then there’s the whole question of whether modern parents are more watchful and nervous about safety than previous generations...CET62009.6阅读理解