known substance 已知物
These microplastics included a substance commonly known as PET and widely used in the manufacture of clothing and food and liquid containers.
这些塑料微粒包括一种通常被称为 PET 的物质，广泛用于服装、食品和液体容器的制造。
This combination is unstable and quickly rearranges itself into a stabler, but still reversible, substance known as an Amadori product.
这种混合物是不稳定的，会迅速重新排列成一种稳定但仍然可逆的物质，这种物质被称为阿马多里产物。
One sign of addiction is using a substance even when it’s known to be harmful.
成瘾的一个迹象就是即使我们知道它有害，但还是会继续实用它。
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