Building design models that abstract your implementation model and source code.

构建抽象你的实施模型和源代码的设计模型。

youdao

Since models are abstract, it is hard for us to learn and use.

由于模型比较抽象，学习和使用不是很方便。

youdao

Since models are abstract, it is hard for us to learn and use.

由于模型比较抽象，学习和使用不是很方便。

youdao