Override abstract method, but keep method abstract?

重写抽象方法，但保持方法摘要？

youdao

Abstract: do not write an abstract. That can be done when the paper is complete.

不要着急写摘要，可以等文章写完后再写。

youdao

The Engineering Index Annual abstract number is found at the beginning of each abstract.

在每篇ei摘要的开头，是工程索引年刊的文摘号。

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But why can I not create an abstract method in a "normal", non-abstract class?

但为什么我不能创建抽象方法在“正常”，非抽象类？

youdao

But why can I not create an abstract method in a "normal", non-abstract class?

但为什么我不能创建抽象方法在“正常”，非抽象类？

youdao