bacteria 
　　n. （plural of bacterium）a type of very small organism that lives in air. earth, water, plants and animals, often one which causes a disease細菌
　　Bacteria grow best in hot, damp conditions, and are often to be found in most domestic bathrooms and kitchens. 細菌適宜在濕熱的條件下生長，在大多數(shù)的家庭廚房和浴室里都能發(fā)現(xiàn)它們。