stirrer（n.） 英 [ˈstɜːrə(r)] 美 [ ˈstɜːrər] late 14c., stirer, "instigator," agent noun from stir (v.). From late 15c. as "implement or machine used for stirring." By 1570s as "bustler, one who is active."该词起源时间：14世纪末
