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(lái)，對(duì)新冠疫苗的需求減少了一半，原因是富裕國(guó)家的人們?cè)絹?lái)越不愿意重復(fù)接種加強(qiáng)針，而低收入國(guó)家的人們對(duì)疫苗接種仍然猶豫不決。
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