"A collection refers to a collection of concrete or abstract objects with certain attributes. Among them, these objects that make up the collection are called elements of the collection. "

As the definition says, x has some properties, and here it can also be said that x satisfies the following conditions: x∈R and X >；; 5。 It means that X is a real number greater than 5, X is any real number greater than 5, A is the set of all X, X is just a number, but it can refer to any real number greater than 5, A is just a number, but it is a set of all numbers that X can refer to, and any real number that X can refer to is only one of A, so these real numbers greater than 5 are all elements of set A, that is, X is an element of set A.

Or you can understand it this way, A is a pile of sand, and X is any grain of sand on this pile of sand, but there is only one grain, so A of a pile of sand is a set, and X of a grain of sand is an element.

We can also use a plane and its points to understand, but it is similar to a pile of sand and a grain of sand, so let's not talk about it.

In addition, the definitions of elements and sets should be easy to understand. You may have questions in a certain context, such as the expression of a topic or a paragraph. If we take this specific context out, we may be able to better solve the puzzle.