Higher Grounds Caf, in West Hills,California, started with 10 students, and now has 50 members working together to sell fair trade, certified organic tea, coffee and cocoa grown by farmers in Africa.

VOA: standard.2009.12.04

There were no reported cases after that, and so by the late '70s, the world was certified sort of free of smallpox worldwide.

在那之后就再也没有过报告,到七十年代晚些时候,已经确认世界各国都摆脱了天花

耶鲁公开课 - 生物医学工程探索课程节选