Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_31 ( melamine_content_mg_kg_ VARCHAR, samples_failed VARCHAR, product VARCHAR )

### Question ###
What's the melamine content of having more than 1 samples failed?

### Accurate 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"