user: Question: Who won silver in the year before 2010, the year Chan Ming Shu won gold?
Columns: ['Year', 'Location', 'Gold', 'Silver', 'Bronze']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'Beijing', 'Chen Sitan', 'Wang Zengxiang', 'Nobutsugu Arai']
SQL:

assistant: SELECT "Silver" FROM "Table" WHERE "Year" < 2010.0 AND "Gold" = 'Chan Ming Shu';