这句话怎么翻译?(英语)

I don't think they were.
They can't have been Japanedse.
They must have been Chinese.

还有

I don't think they were.
They can't have been butchers.
They must have been bakers.

什么意思?

翻译网上面我看不懂....= =

我不认为他们曾经是

他们不可能是日本人

他们一定是中国人

第二部分的两种人改为

侩子手

面包师

其他一样

我不认为他们。他们不能被日本人。他们必须有中文。我不认为他们。他们不能被刽子手。他们必须有师。