The stillman has worked in the distillery for 20 years and mastered the art of brewing various spirits.

stillman 是由 still（蒸馏器）和 man（人）组成的复合词，字面意思是"操作蒸馏器的人"，即"蒸馏师"，指在酒厂专门负责蒸馏工艺的技术人员。