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.
自今年年初以来，对新冠疫苗的需求减少了一半，原因是富裕国家的人们越来越不愿意重复接种加强针，而低收入国家的人们对疫苗接种仍然犹豫不决。
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