parenthesis
/pəˈrenθɪsɪs/noun
(pl. parentheses /-siːz/)
1- a word, clause, or sentence inserted as an explanation or afterthought into a passage which is grammatically complete without it, in writing usually marked off by brackets, dashes, or commas插入成分; 插入的单词（或句子）。
1.1
- （一般作parentheses）a pair of round brackets () used to include such a word, clause, or sentence（插入词句用的）圆括号。
1.2
- an interlude or interval插曲, 间歇：
the three months of coalition government were a lamentable political parenthesis.
三个月的联合政府是一段可悲的政治插曲。
短语
in parenthesis
- as a digression or afterthought作为（离题的）插话; 作为事后的想法。
词源
mid 16th cent.: via late Latin from Greek, from parentithenai 'put in beside'.