同时提供接口和抽象类是多余的，但我发现这样很方便：在大多数情况下，我只需要抽象类，但接口支持多继承性。

Offering both an interface and an abstract class is redundant, but I find it convenient: in most cases, I only need the abstract class, but the interface enables multiple inheritance.

youdao

她说,“‘我要在2009年保持体形。’ 这句话很抽象。

I am going to get in shape in 2009.

youdao

我相信，这种为众生成佛的愿望，对我们大多数人来说是很抽象的。

And I'm sure this this attitude of wishing enlightenment for others, for many of us, are very abstract.

youdao

OK, so what have I done? I just added a little bit more now. I'm now running through a pair of loops. Again notice the encapsulation, that nice abstraction going on, which is what I want. Once I get to this stage though by the way, there might be more than one solution.

我现在运行了一对循环,再一次注意这个封装,抽象得很好，这就是我想要的结果,我按这种方式走到这一步的时候,可能会有多组答案。

麻省理工公开课 - 计算机科学及编程导论课程节选

Now, a lot of today is going to be fairly abstract, so I just want to remind you that Game Theory has some real world relevance.

今天所讲的很多内容会很抽象,但我想要提醒大家,博弈论与现实世界是紧密联系的

耶鲁公开课 - 博弈论课程节选

So literary can sometimes be very abstract like mathematics, and therefore, if someone says make me a movie, showing me what the square of minus two means that is going to be a challenge.

文学有时候也可以很抽象,像数学，因此如果有人说,给我做一部电影吧,给我展示一下负二的平方,那将是一个挑战。

麻省理工公开课 - 电影哲学课程节选