柯林斯詞典bacterium /b?k?t??r??m/ 1. Bacterium is the singular of . 細(xì)菌; bacteria的單數(shù) 返回 bacterium劍橋詞典a type of very small organism that lives in air , earth , water , plants , and animals , often one that causes disease 細(xì)菌 an illness caused by bacteria in drinking water 飲用水中細(xì)菌引起的疾病 The bacterium Streptococcus pneumoniae causes about a third of some 3,000 annual meningitis cases . 在每年約3000起腦膜炎病例中，1/3左右是由一種叫“肺炎鏈球菌”的細(xì)菌引起的。 返回 bacterium