老师今天出差了！英文翻译

Teacher is on business today.
be on business表示"出差".

My/Our teacher is out on a business trip today.

Our teacher is on leave for business today

on business 是个沿用的表达．表示商业上的出差

老师没商业的吧．只能是on leave for business

如果是私人事务
on leave for personal business

Teachers travel today!