Liu Jianquan, a 26-year-old student at the University of Tsukuba (an hour`s drive from Tokyo), said he sometimes has to call the police to get his Japanese dorm mates to quiet down.

• 26岁的刘建全就读于筑波大学（距东京一小时的路程），他说有时候他不得不向警察求助，才能让他的那些日本室友安静下来。