今天我们要学的词是 fluoride. Fluoride 氟化物。The U.S. government is lowering the recommended amount of fluoride added to drinking water for the first time in more than 50 years. 美国政府50多年来首次降低饮用水建议添加的氟化物的含量。有关官员解释说，People may get too much fluoride these days because it is also added to toothpaste, mouthwash and other products. 现在牙膏，漱口液等产品内也添加了氟化物，这种情况可能会使人们摄取过多的氟化物。好的，今天我们学习的词是 fluoride, fluoride, fluoride...