因為你post的文章有滿多拼音與文法錯誤，所以我整篇重修一次：
The F.D.A. is responsible for the safety of most food products and medicines.
It guarantees that medical devices and biological products are safe and
effective. It also guarantees the safety of beauty products and the country's
blood supply.
country's blood supply是指國家的血庫存量。
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