watchful
US /ˈwɑːtʃ.fəl/
UK /ˈwɑːtʃ.fəl/
形容词
1.
警惕的, 留心的
watching someone or something closely; alert and vigilant
示例:
•
The mother kept a watchful eye on her children at the park.
母亲在公园里警惕地注视着她的孩子们。
•
Security guards must remain watchful at all times.
保安人员必须时刻保持警惕。
在 Lingoland 学习这个单词