一些化合物，包括焦磷酸和柠檬酸锌，这些常常被使用，而且被证明是有效的。

Chemical compounds, including pyrophosphates and zinc citrate, are often added and have been proven effective.

youdao

一些化合物，包括焦磷酸和柠檬酸锌，这些常常被使用，而且被证明是有效的。

Chemical compounds, including pyrophosphates and zinc citrate, are often added and have been proven effective.

youdao