Reaserchers say public mistrust of vaccines is causing diseases like measles and yellow fever to spread. The scientists said the lower levels of trust can lead to people refusing vaccines. ___________________________ 研究人员认为公众对疫苗的信任危机导致了麻疹,黄热病等疾病的传播。科学家说越来越低的信任水平会导致人们拒绝打疫苗，______________________
