The living organisms somehow concentrated the minerals by biological processes.生命体通过某种生物过程聚集矿物质。Biological systems have been doing this for billions of years.生物系统亿万年来一直都是这样。Most young women feel a biological need to proc...
意思就是把金属牙箍紧紧固定在牙齿上.This means 10 metal 11 brackets are 12 cemented to teeth.我还常扭伤膝盖 、 腋窝出汗,甚至有东西会塞进我的牙箍里.I constantly had a sprained ankle, wet armpits and things stuck in my braces....