bacteria [bækˈtɪriə] n. 细菌

英英解释（牛津词典）：

the simplest and smallest forms of life. Bacteria exist in large numbers in air, water and soil, and also in living and dead creatures and plants, and are often a cause of disease.

bacteria的特点：

最简单和最小的生命形式（the simplest and smallest forms of life ）细菌大量存在于空气、水和土壤中，也存在于活的和死的生物和植物中，它们往往是疾病的原因。（ Bacteria exist in large numbers in air, water and soil, and also in living and dead creatures and plants, and are often a cause of disease.）

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根据艾宾浩斯记忆原理，请复习单词：

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