Not have a lick 没有一丁点儿

Oscar学识过人，是个原子物理学博士，名牌大学的教授，但是在日常琐事上却笨得出奇，既不会上街购买食品，也不能修理家用器具，更不善管理个人账目。总之极端缺乏生活常识。好，我们看他说说这位Oscar。Sure, Oscar has all this education. But he doesn't have a lick of common sense -- he can't change a flat tire on his car or drive a nail straight through a board to save his life.

Oscar确实受了那么多的教育，但是对常识却一无所知，即使是要他的命，他也换不了汽车轮胎或把钉子敲进木板而不敲歪。

从Oscar不会处理那些日常事务的例子听来，他极其缺乏生活常识，所以说: he doesn't have a lick of common sense。意思是他一点儿生活常识都没有。