Performers participate in the opening ceremony of the World Swimming Championships at the Sant Jordi arena in Barcelona, July 19, 2013. The World Swimming Championships will take place July 20 to August 4.[Photo/Agencies]
Geng Jiasheng, 54, a national master technician in the manufacturing industry, is busy working on improvements for a new removable environmental protection toilet, a project he has been devoted to since last year.
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