More and more students from Thailand, Myanmar and Laos have come to China to study Mandarin, while Mandarin is taught in some primary schools in Japan, the Republic of Korea and Mongolia.
However, promoting Mandarin in less-developed regions is not easy, and attracting qualified teachers and volunteers is one of the biggest problems.
"There are some practical difficulties for the teachers," Xu said, explaining that Mandarin teachers sent to some developing countries have to deal with certain problems.
Xu has increased the subsidy given to teachers and volunteers to encourage more of them to go to developing countries.
On the other hand, the fundamental solution is to help train local Mandarin teachers, she said.
126-centimeter-tall couples attend group wedding