Currently the FDA allows bottled water with added fluoride to contain between 0.8 and 1.7 milligrams per liter.

目前，美国食品药品监督管理局允许加入瓶装水中的氟含量在每公升0.8至1.7毫克之间。

Before tap water makes its way to your faucet, water treatment centers sometimes add compounds containing chlorine, up to 4 milligrams per liter, in order to purify it.

自来水进入到你的水龙头以前，为了净化水，净水中心有时会在水中加入含有氯的化合物，至多可达每升4毫克。