Định Nghĩa và Ý Nghĩa của "blind spot"

What is the origin of the idiom "blind spot" and when to use it?

The idiom "blind spot" originally referred to an actual area in a person's field of vision that cannot be seen, especially when driving a vehicle. This area is a result of the positioning of side mirrors and can lead to accidents if not accounted for. This expression is now used to refer to a subject or topic that someone finds challenging, uninteresting, or difficult to understand.