She didn't realise that you don't put an X on every communication. So she even put it on business letter including one to the Inland Revenue, which is the government department in the UK that deals with tax.
她没有意识到不用把" X" 放在每封通信上。所以她甚至把它放在商业信件中,包括给税务
的一封,那指的
英国处理税务的一个政府部门。