taster

1. N-COUNT A taster is someone whose job is to taste different wines, teas, or other foods or drinks, in order to test their quality. 品尝师; 试味员

...a wine taster. ...一名品酒师。

2. N-COUNT If you refer to something as a taster of something greater, or of something that will come later, you mean that it gives you an idea what that thing is like, and often makes you interested in it or want more of it. 样品; 试用品[usu sing, oft N 'of' n]

The book is essentially a taster for those unfamiliar with the subject. 这本书基本上是让那些不熟悉该学科的人对其有个初步的了解。