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in parentheses
常用复数形式 parentheses。
The date is given in parentheses.
日期写在圆括号内。
圆括号；括号
先理解核心含义，再看它在真实句子里的用法。
圆括号；括号
Either of the round brackets ( ), used to enclose extra information in writing or to group terms in mathematics.
The date is given in parentheses.
日期写在圆括号内。
A clause, phrase or word which is inserted (usually for explanation or amplification) into a passage which is already grammatically complete, and usually marked off with brackets, commas or dashes.
Either of a pair of brackets, especially (mainly US) round brackets, ( and ) (used to enclose parenthetical material in a text).
Such brackets as used to clarify expressions by grouping those terms affected by a common operator, or to enclose the components of a vector or the elements of a matrix.
Please put the year in parentheses after the author's name.
请把年份放在作者姓名后面的圆括号里。
The speaker added a brief parenthesis about his own experience.
演讲者插入了一段关于自己经历的简短插入语。
In academic writing, parentheses are often used to cite sources.
在学术写作中，圆括号常用于引用来源。
常用复数形式 parentheses。
The date is given in parentheses.
日期写在圆括号内。
Please put the explanation in parentheses.
请把解释放在圆括号里。
此处 parenthesis 指插入的话语。
He added a remark as a parenthesis.
他添加了一句插入语。
Not this
There are two parenthesis in the sentence.
Use this
There are two parentheses in the sentence.
英语中括号的复数形式是 parentheses (不规则变化)，不能直接加 s。中文‘括号’单复数同形，学习者容易忽略复数变形。
Not this
He added a parenthesises to clarify.
Use this
He added a parenthesis to clarify.
parenthesis 的复数形式是 parentheses，不是 parenthesises。学习者误以为规则加 -es 形成复数，实际上应使用不规则变化。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在括号里
Please write the answer in parentheses.
请把答案写在括号里。
用括号括起来
The translator decided to enclose the original term in parentheses.
译者决定用括号把原文术语括起来。
用括号隔开；用括号标出
The author set off the clause in parentheses to add a side note.
作者用括号把从句隔开，以加入一句附注。
左圆括号；前括号
You forgot an opening parenthesis in the code.
你的代码里漏了一个左圆括号。
右圆括号；后括号
Make sure every closing parenthesis matches an opening one.
确保每个右圆括号都有一个左圆括号与之对应。
作为题外话；顺便说说
He noted, by way of parenthesis, that the date might change.
他顺便提到，日期可能会有变化。
作为插入语；顺便说一句
He mentioned, in parenthesis, that he had never seen the film.
他顺便说了一句，自己从没看过那部电影。
顺便提一句；作为题外话
By way of parenthesis, I might add that the meeting is still scheduled for Friday.
顺便提一句，会议仍安排在周五举行。
Use parenthesis naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：一对圆括号( )像两只手，夹住插入句中的解释；parenthesis 拼作 paren-the-sis，括起来的那段话就是插入语。
语域：formal 常见场景：formal writing、grammar and punctuation guides、academic prose parenthesis 多用于正式书面语，常见于学术写作、语法说明和标点使用指南中；日常口语中这个词较少直接使用。
这些词都以 -thesis 结尾，但发音不同。thesis 与 prosthesis 押韵（/-ˈθiːsɪs/）；synthesis 与 photosynthesis 押韵（/-ˈsɪnθəsɪs/）；hypothesis 与 antithesis 各有不同的重读元音，均不与上面两组或 parenthesis 押韵。注意：所有词都只是 parenthesis 的形似词，并不与 parenthesis /pəˈrenθisis/ 押韵，因为 parenthesis 的重音在 ren 上。
Dictionary facts from ECDICT, WIKTIONARY.