[To learn English] Scientists at the University of Witwatersrand have designed South Africa's first app to warn residents of pollution levels, as Johannesburg suffers a spike in coal emissions in recent weeks, causing breathing problems and other health issues. 由于约翰内斯堡近几周煤炭排放量激增，导致呼吸困难和其他健康问题，威特沃特斯兰德大学的科学家们设计了南非首款应用程序，用于向居民发出污染水平警告。 LearnEnglishLeave a remark
