1. 专业;专长
Someone's speciality is a particular type of work that they do most or do best, or a subject that they know a lot about.

1. the special line of work you have adopted as your career

e.g. his specialization is gastroenterology

Synonym: specializationspecialisationspecialtyspecialism

2. a distinguishing trait

Synonym: peculiarityspecialnessspecialtydistinctiveness

3. an asset of special worth or utility

e.g. cooking is his forte

Synonym: fortestrong suitlong suitmetierspecialtystrong pointstrength