1.While hairbrained continues to be used, it should be avoided in favor of harebrained which has been established as the correct spelling.
虽然hairbrained还在继续使用，但是，既然harebrained是最初的正确拼法，我们就应该避免这种混淆使用的情况。
2.The spelling hairbrained also has a long history, going back to the 1500s when hair was a variant spelling of hare.
而hairbrained这个拼法也有很长的历史，可以追溯到16世纪，那时候hair是hare的另一种拼法。