He was European and to the students seemed very sophisticated.

### 解释 sophisticated 是由名词 sophistication（老练、世故）去掉名词后缀 -ion 加上形容词后缀 -ed 构成的形容词，意思是"老练的、世故的、复杂的"。这个词常用来形容人见多识广、举止优雅，或者形容事物精细复杂。