1N-COUNT [usually plural]圆括号Parentheses are a pair of curved marks that you put around words or numbers to indicate that they are additional, separate, or less important. (This sentence is in parentheses.) 圆括号
2N-COUNT 插入语 A parenthesis is a remark that is made in the middle of a piece of speech or writing, and which gives a little more information about the subject being discussed. 插入语
3PHRASE 插一句 You say 'in parenthesis' to indicate that you are about to add something before going back to the main topic. 插一句
In parenthesis, I'd say that there were two aspects to writing you must never lose sight of.