round brackets
noun [ plural ] UK uk/ˈraʊnd ˌbræk.ɪts/ us/ˈraʊnd ˌbræk.ɪts/ (also mainly US parentheses)
圆括号
the symbols ( ) that are put around a word, phrase, or sentence in a piece of writing to show that what is inside them should be considered as separate from the main part