他对这个学科只有肤浅的了解。

He only has a ___superficial knowledge of the subject.

这两幅画之间有表面的相似之处。

There is a ___superficial resemblance between the two paintings.

学生从仓促的课程中通常只获得肤浅的理解。

Students often acquire only ___superficial understanding from rushed courses.