specialize in

汉语翻译

例句：

1. In fact, we specialize in this in with a long history.
   其实我们专营此项商品已有多年的历史了。
2. In collage I specialize in organic chemistry.
   在学院里我主修有机化学。
3. I specialize in the sale of cotton piece goods. May I act as your agent?
   我专营棉布买卖，我可作为你们的代理吗？