On Monday, the country reported 21 imported cases and zero locally transmitted symptomatic infections. If the trend continues, China could become the world's first country to control a major Delta outbreak.

生词短语:

imported cases

境外输入病例

locally transmitted cases

本土传播病例

transmit

传播

infection

感染；感染病例

outbreak

(战争、疾病等的) 爆发