今天背到的单词是foresight，联想到昨天配对的事就查了一下词典，果然有backsight这个单词。词义肯定和sight有关，但是foresight和backsight并不对偶。为了便于猜词意今天给了两个例句。先猜一下词意，然后再查词典，意外可以让我们更容易的记住单词。

例句：
They had the foresight to invest in new technology.
I've sometimes not had much of an option for a good long backsight.