训练营的小伙伴问到了插入语，今天就讲讲插入语（parenthesis）吧。
01 什么是插入语
thefreedictionary.com
插入语可以是单词、短语或从句，插入到句子/段落中，进行解释说明或补充说明。把插入语从句子中移除后，句子在语法上仍然正确。插入语一般会用逗号（commas）、破折号（dashes）、圆括号（parentheses）与句子区分开。
02 逗号、破折号、圆括号的用法
一般而言，逗号、破折号、圆括号是在插入语前后成对（in pairs）出现的。只有当插入语结束后句子也结尾了（用句点），才会用一个逗号/破折号。举例说明：
Lee, however has never found out what he loves to do. ✘
Lee, however, has never found out what he loves to do. ✔
03 更多示例
Paul, on the other hand,is considered extremely trustworthy.
House prices in Alton, which is only 25 minutes from London,are soaring.
My family is getting a new dog from the shelter (we are going to name him Barney).
Marie (8 years-old) is a little girl who goes to school with my brother.
Did you leave your bag (red, black handles) in the classroom?
Due to pub quizzes, Buzz Aldrin —the second man on the Moon— is now as famous as Neil Armstrong.
It depends — as my mother used to say — on trust.
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by being more experienced or knowledgeable 在这里是方式状语，表示“通过……”，相当于through。而because of表示原因，所以不能在这里代替by