Additionally, the cell wall helps maintain their shape: the round-shaped bacteria are called cocci, the rod-shaped ones are called bacilli, spiral-shaped ones are spirilla, and sometimes the same bacteria can have multiple forms in which case they're called pleomorphic.
此外，细胞壁有助于保持其形状：圆形的细菌称为球菌，棒状的细菌叫做杆菌，螺旋形的是螺旋菌，有些细菌具有不同的形态，因此它们被称为多形菌。