one's speciality 撒手锏
teach in one's speciality 专长任教
show one's speciality 拿出绝招
The Great Lakes chemical corporation, formerly known as Octel, has been in the town for 50 years, and is one of the world's leading producer of certain speciality chemicals for applications like water treatment.
BBC: NEWS | UK | Wales | Bid to save 100 chemical jobs
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