① 细菌(单细胞微生物) 本义 名词 生命域 理据— 例句A phone is as contaminated with bacteria as a toilet is.手机沾染细菌的程度不亚于马桶。Bacteria are so small that they cannot be seen with the naked eye.细菌微小到无法用肉眼看到。 溯源路径本义