Melamine was approved to be a 'food contact substance' in the late 1960s or early 1970s.

上世纪60年代末、70年代初，三聚氰胺曾被批准为“可与食品接触的物质”。

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Melamine was approved to be a 'food contact substance' in the late 1960s or early 1970s.

上世纪60年代末、70年代初，三聚氰胺曾被批准为“可与食品接触的物质”。

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