这个产品是如何被证明有效的，测试基准又依据的是什么科学标准？

How was the product proven and what scientific standards were used in the testing baseline?

youdao

这个产品是如何被证明有效的，测试基准又依据的是什么科学标准？

How was the product proven and what scientific standards were used in the testing baseline?

youdao