求翻译：这封信是应CDI的要求用来证明所有的塑料原料都是经过FDA认证的食品级的原料，此原料里加一定量的碳酸钙，也是经过FDA认证的食品级的材料。特此证明。是什么意思？

This letter is to be used to prove that all the requirements of CDI of plastic raw materials are FDA-approved food-grade materials, this material a certain amount of calcium carbonate in Riga, is FDA-approved food-grade material. Hereby certify that.

This letter is used to prove that the request should be CDI all the plastic raw materials are all after FDA certification of food grade of raw materials, the raw materials, Riga, and is also a quantity of calcium carbonate after FDA certified food grade materials. THIS IS TO CERTIFY that.

This letter is should the CDI request use for to prove all plastic raw material all is passes through FDA authentication food grade raw material, this raw material riga ration calcium carbonate, also is passes through the FDA authentication food grade material.Proved specially.

This letter is a request of the CDI used to justify all plastic materials are FDA-certified food grade raw materials, put a certain amount of this raw material of calcium carbonate, is also FDA-certified food grade materials. This is to certify that.