他们承认，但是，饮用水中高氯酸盐提出了一定程度的风险。

They do admit, however, that perchlorate in drinking water presents a certain degree of risk.

youdao

他们承认，但是，饮用水中高氯酸盐提出了一定程度的风险。

They do admit, however, that perchlorate in drinking water presents a certain degree of risk.

youdao