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.
教師在教學中起重要的作用。

eg. Some of these same chemicals play an important role in how you feel pain.
這些物質中的一些對于人的疼痛感起至關重要的作用。

2.specialty
n. 專業，專長；特產；特性；招牌菜
adj. 特色的；專門的；獨立的

eg. What is the specialty of the restaurant?
這家餐廳的招牌菜是什么？

eg. "You should get to know recruiters and search firms in your area" of specialty.
應該了解你所在”的專業“領域的招聘人員和獵頭公司。”

eg. The tourism souvenirs are commemorative commodities of local specialty, which were brought by travelers at the travel destination.
旅游紀念品是旅游者在旅游目的地購買的、具有當地特色的紀念性商品。