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Chen, who regularly deals with the Japanese in the course of her work, said she is very grateful for Japan's help.

Children may think it's disturbing rather than helpful to them because many volunteers stay for a short time during summer and winter vacations, not for a year or two.

Children pose with watermelons carved into the Chinese character Liqiu, the beginning of autumn on the traditional Chinese calendar, in Hefei in East China's Anhui province on August 6, 2017. This year's liqiu falls on Monday. [Photo/VCG]

Cheng Guangxu, the university's Party secretary, said the course aims to offer guidance to the students to help them become more qualified teachers.

Chengdu No 9 Water Purification Plant, one of the eight plants, has the largest sewage treatment capacity of its kind in downtown Chengdu - 1 million tons per day. Of all the reclaimed water, 700,000 tons drain into the river and 300,000 tons are recycled to return water to dwindling rivers or irrigate the meadows at the plant.