It consists of peptidoglycan which usually helps differentiate whether bacteria are gram positive or gram negative.

细胞壁由肽聚糖组成，通常可以助分细菌的种类，判断它们是革兰氏阳性菌还是革兰氏阴性菌。

We can use this to differentiate Staph saprophyticus from other gram positive cocci, like streptococci and enterococci, which are catalase negative.

们可以利用这一特性来分腐生葡萄菌和其他革兰氏阳性菌，菌和肠菌这一类过氧化氢酶阴性的细菌。

They have a cell wall which protects the bacteria, determines whether they are gram positive or gram negative bacteria and also helps maintain their shape.

保护细菌的细胞壁决定了细菌是革兰氏阳性菌还是革兰氏阴性菌，并且参与维持细菌的形状。

When doing a Gram stain, Clostridium tetani stains purple— or gram positive— and it's a bacillus, meaning that it looks like a big cylinder or rod under the microscope.

革兰氏染色中，破伤风梭菌显紫色（革兰氏染色阳性），呈棒状：显微镜下外观像一个巨大的圆柱体或棒子。