SCHEMA:
CREATE TABLE table_name_31 (melamine_content_mg_kg_ VARCHAR, samples_failed VARCHAR, product VARCHAR)
USER:
What's the melamine content of 英雄牌嬰幼兒配方乳粉 having more than 1 samples failed?

QUERY:
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"