在中文中，“因公去北京”可以说成“因工作去北京”或者“出差北京”。这个短语的来源可能是因为去北京是为了工作目的而出差，所以用“因公”来表示。下面是一些英文例句和中文翻译：
I'm going to Beijing on business. (我要因公去北京。)
He is going to Beijing for work. (他要因工作去北京。)
She is travepng to Beijing on a business trip. (她正在出差北京。)
They are going to Beijing for a meeting. (他们要去北京开会。)