user: ### NOW ANSWER:
Question: Which Silver has a Nation of china, and a Bronze smaller than 7?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Japan', 6.0, 6.0, 4.0, 16.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Nation" = 'china' AND "Bronze" < 7.0;