watchful
US /ˈwɑːtʃ.fəl/
UK /ˈwɑːtʃ.fəl/
形容詞
1.
用心深い
paying careful attention and ready to deal with problems:
例:
•
Under the watchful eye of their mother, the two boys played on the beach.
Lingolandでこの単語を学ぶ
用心深い
paying careful attention and ready to deal with problems: