eagle eye
noun [ C usually singular ] uk/ˌiː.ɡəl ˈaɪ/ us/ˌiː.ɡəl ˈaɪ/
敏锐的眼光;锐利的目光
If someone has an eagle eye, they notice everything, even very small details.
We sat down and started the exam under the eagle eye of the teacher. 在监考老师锐利目光的监视下，我们坐下来开始答卷。