As he sees it, there are four basic kinds of food, graded by the degree to which they are processed.

他认为，按照加工程度分级，存在四种基本的食物。

Vethaak recommends not heating plastic containers in the microwave, even if they claim to be food grade, and not leaving plastic water bottles in the sun.

Vethaak 建议不要用微波炉加热塑料容器，即使它们声称是食品级的，也不要把塑料水瓶放在阳光下。

The real way to do this is to use a food grade lye, but we're doing a work around of baking soda that has been previously baked in the oven at 250 degrees Fahrenheit for an hour.

真正的方法是使用食品级碱液，但我们正在使用小苏打， 小苏打之前已在烤箱中以 250 华氏度烘烤一小时。