Ms.Liu, who taught in Bulgaria, says she had no idea that the Chinese were considered loud until she and her colleagues drew disapproving looks at restaurants in Sofia.

• 在保加利亚教学的刘世茗说，她以前并不了解别人认为中国人太爱喧哗，直到她和同事在索非亚的一家餐馆吸引了其他人不满的目光后才认识到这一点。