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1.This antibiotic is effective against many types of bacteria.
这种抗生素对许多类型的细菌有效。
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2.The patient was given a course of this antibiotic for his infection.
患者接受了这段抗生素治疗他的感染。
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3. A study found that this antibiotic could be used to treat certain viral infections.
一项研究发现，这种抗生素可以用于治疗某些病毒性感染。