Students do ear exercises during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, at a primary school in Zaozhuang City, east China's Shandong Province, Feb. 28, 2013. (Xinhua/Sun Zhongzhe) 

Students show her drawing about noise during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, in Liaocheng City, east China's Shandong Province, March 1, 2013. (Xinhua/Zhang Zhenxiang)

A woman named Chang Jinglan experiences the hearing-aid during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, in Beijing, capital of China, March 1, 2013. (Xinhua/Bu Xiangdong)

A volunteer from a local hospital introduces the general knowledge of protecting ears to the students and masses during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, in Suzhou, east China's Jiangsu Province, March 1, 2013. (Xinhua/Hang Xingwei)

A medical volunteer introduces the general knowledge of ears to the students during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, at a primary school in Zigui County, central China's Hubei Province, March 1, 2013. (Xinhua/Wang Huifu)

A staff member introduces the knowledge of hearing-aid to the elders during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, in Beijing, capital of China, March 1, 2013. (Xinhua/Bu Xiangdong)

Students do ear exercises during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, at a primary school in Maanshan City, east China's Anhui Province, March 1, 2013. (Xinhua/Cheng Qianjun)

A medical volunteer named Wang Xinrong introduces how to protect ears to the students during an activity celebrating the upcoming Ear-care Day, which falls on March 3 every year, at a primary school in Zigui County, central China's Hubei Province, March 1, 2013. (Xinhua/Wang Huifu)