我在看单字的例句
忽然忘记这个文法技巧
想问是那里的
A murderer is, by definition , one who intentionally kills another person.
请问整句逗点怎么来的
谢谢你

这就单纯是副词插入的用法，你可以移到句中，例如：He,however, doesn't like the way she handle the situation.

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Galavant: My time, at last, has come!

菜逼八，多写考题，仔细看题目、文章里常常都有