今天我们要学的词是 bacteria. Bacteria 名词，细菌。The World Health Organization issued a list of the top 12 types of bacteria that are most dangerous to humans. 世界卫生组织公布了对人体危害最严重的12个类别的细菌清单。New research shows that some friendly bacteria on our skin can produce natural antibiotics and help ward off bad bacteria. 最新研究显示，人体皮肤上对人体有利的细菌可以产生天然抗生物质，防范有害细菌的威胁。好的，我们今天学习的词是 bacteria, bacteria, bacteria...