Tests showed that the XF-73 "bacteriocidal" compound continued to destroy MRSA after repeated treatment, long past the stage when it would have become resistant to antibiotics.
试验证明XF - 73这种化合物在重复治疗下对MRSA有持续杀灭作用，而在过去，使用抗生素则MRSA很快就产生抗药性。
Herbicide-resistant and pesticide-resistant crops could give rise to super-weeds and super-pests that would need newer, stronger chemicals to destroy them.
抗杂草和害虫的庄稼可能会导致生命力更强的杂草和害虫，而这将需要更新更强的化学药品才能杀死它们。
Chemotherapy and radiation can causecancercells to mutate and become resistant and difficult to destroy. Surgerycan alsocause cancer cells to spread to other sites.
化疗及放射线治疗会造成病患癌细胞突变及产生抗体而变得难以摧毁，而手术则易使癌细胞扩散至其它部位。
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