Table schema:
CREATE TABLE table_name_31 (melamine_content_mg_kg_ VARCHAR, samples_failed VARCHAR, product VARCHAR)

Question: What's the melamine content of 英雄牌嬰幼兒配方乳粉 having more than 1 samples failed?
SQL: SELECT melamine_content_mg_kg_ FROM table_name_31 WHERE samples_failed > 1 AND product = "英雄牌嬰幼兒配方乳粉"