a person whose job is to judge the quality of wine, tea, etc. by tasting it 试味员；品酒师；品茶员 - (informal, especially British English)
a small example of something for you to try in order to see if you would like more of it （供尝试的）小样品 The programme is intended as a taster for those who might like to find out more about studying computer science. 这个项目是为那些想了解更多计算机科学知识的人设计的。
Word Originlate Middle English: in early use from Anglo-Norman French tastour, from Old French taster ‘to taste’; later from taste + -er.