Methicillin and penicillin belong to the so-called " beta lactam" family of antibiotics.

甲氧西林和青霉素都属于所谓的“β-酰胺”抗生素族。

" Staph aureus bacteria that carry these genes are therefore resistant to most beta lactam antibiotics."

“因，这些基因的金黄色葡萄球菌对大多数β-酰胺抗生素有耐药性。”