1.play an important role in 在某方面起重要作用，扮演重要角色

eg. The teacher plays an important role in the learning process.
教师在教学中起重要的作用。

eg. Some of these same chemicals play an important role in how you feel pain.
这些物质中的一些对于人的疼痛感起至关重要的作用。

2.specialty
n. 专业，专长；特产；特性；招牌菜
adj. 特色的；专门的；独立的

eg. What is the specialty of the restaurant?
这家餐厅的招牌菜是什么？

eg. "You should get to know recruiters and search firms in your area" of specialty.
应该了解你所在”的专业“领域的招聘人员和猎头公司。”

eg. The tourism souvenirs are commemorative commodities of local specialty, which were brought by travelers at the travel destination.
旅游纪念品是旅游者在旅游目的地购买的、具有当地特色的纪念性商品。