正确的应该是buy的过去式为bought ，bought中文意思是v. 买（buy 的过去式和过去分词）

If you bought your computer 10 years ago and you are reluctant to say goodbye， take note of how long it takes your PC to boot up.

如果你的电脑从买来已经超过10年而你又舍不得扔，那就把你电脑开机所需的时间记下来。