TheyThe use a fluorid of fluoride to protect teeth is common in many parts of the world.
化物保护牙齿被世界上很多国家所使。
化物TheyThe use a fluorid of fluoride to protect teeth is common in many parts of the world.
化物保护牙齿被世界上很多国家所使。
声明：以上例句、词性
类均由互联网资源自动生成，部未经过人工审核，其表达内
代表本软件的观点；若发现问题，欢迎向我们指正。
