What does the subway old man mean by looking at his mobile phone?

This stalk actually refers to an expression pack. An old man in the expression pack was looking at his mobile phone on the subway and didn't know what he saw. Anyway, he just squinted and frowned. It's so cute.

Look at the cervical spine injury of mobile phone on the subway. People who play with their heads down for a long time will make the muscles in the neck unable to rest, and the nerves and blood vessels in the neck will be squeezed, which will lead to many diseases, such as brain swelling and confusion.

The influence of watching mobile phones on study and work on the subway. Playing mobile phone can make people very tired. There are friends, favorite games and novels in your mobile phone, which will keep your spirit in an exciting and active state at all times.