一个英语翻译的问题她在当地一家银行找到一份出纳员的工作,但不久因不称职而被解雇了.She got a post as a cashier at a local bank. But she was soon fired because she proved to be incompetent.为什么答案中间是句号,BUT可以引导一个完整的句子?

问题描述:

一个英语翻译的问题
她在当地一家银行找到一份出纳员的工作,但不久因不称职而被解雇了.
She got a post as a cashier at a local bank. But she was soon fired because she proved to be incompetent.
为什么答案中间是句号,BUT可以引导一个完整的句子?

but是转折连词,可以引导完整句子.