Boys whose parents are migrant workers look out of the window in a train on their way back to hometowns in Central China's Hubei province, August 30, 2016. [Photo/IC]

As the summer vacation comes to an end, many schoolchildren who are left behind by their migrant parents are on their way back to hometowns before the new semester starts on Sept 1, 2016. The children were brought by their parents in late June or early July from hometowns to the big cities where they are working to spend the vacation as part of family reunion.