Demand for Covid-19 vaccinations has halved since the start of the year as people in rich countries become more reluctant to take repeated booster shots and vaccine hesitancy persists in low-income nations.
自今年年初以來，對新冠疫苗的需求減少了一半，原因是富裕國家的人們越來越不愿意重復接種加強針，而低收入國家的人們對疫苗接種仍然猶豫不決。
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