seeing is believing said to mean that if you see something yourself, you will believe it to exist or be true, despite the fact that it is extremely unusual or unexpected 意思是如果你自己看到某件事，你就会相信它存在或是真的，尽管它是极其不寻常或出乎意料的;眼见为实、百闻不如一见 I never thought Mark would get out of bed before lunchtime on a Saturday, but seeing is believing! 我从没想到马克星期六会在午饭前起床，真是眼见为实!