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1. The new drug is designed to target the virus that causes AIDS.
这种新药旨在针对引起艾滋病的病毒。
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2. Viruses are responsible for many diseases, including cancer and malaria.
病毒导致许多疾病，包括癌症和疟疾。
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3. The researcher found that the bacteria had developed resistance to the antibiotic.
研究者发现细菌对抗生素产生了抗药性。