Second left-behind refers to left-behind children in rural areas who are moved to cities by their parents and are surrounded by strangers without friends or playmates because their parents are busy with their work every day.
According to the above definition, which of the following is second left-behind?
A large number of migrant workers live in an apartment in a city. Many of them bring their children to the city for summer vacation. Every day, children with different accents play together in the nearby grocery store and square