special的过去式和用法

special
['speʃ(ə)l]
n. 特使,特派人员；特刊；特色菜；专车；特价商品
adj. 特别的；专门的,专用的
她只有形容词和名词的意思
动词才能谈过去式
她的动词形式是:
specialize
['speʃəlaiz]
vi. 专门从事；详细说明；特化
vt. 使专门化；使适应特殊情况；详细说明
过去式：specialized
University professor who specializes in the history of the Russian empire.
…一位专门研究沙俄历史的大学教授.
If you specialize in a thing, you know a lot about it and concentrate a great deal of your time and energy on it, especially in your work or when you are studying or training. You also use specialize to talk about a restaurant which concentrates on a particular type of food. (在某事物上) 有专长