Low immunization coverage, coupled with the widespread infestation of Ae. aegypti in cities near endemic areas and frequent travel to and from endemic areas, have increased the risk for the occurrence of outbreaks of urban yellow fever.是什么意思_Low immunization coverage, coupled with the widespread infestation of Ae. aegypti in cities near endemic areas and frequent travel to and from endemic areas, have increased the risk for the occurrence of outbreaks of urban yellow fever.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句