She took a doubtful step and then undid it To raise herself and look again.

她犹豫地踏出了一步又收了回来,又上去继续往下看。

耶鲁公开课 - 现代诗歌课程节选

My cat yesterday actually undid my Yale password last night.

我家"小猫"昨晚把我耶鲁账号的密码给改了

耶鲁公开课 - 欧洲文明课程节选