Find what varies and encapsulate it.

找出变化的东西，封装它！

youdao

We often try to take what varies in a system and encapsulate it.

我们经常试着找出系统中的变化并封装它。

youdao

We often try to take what varies in a system and encapsulate it.

我们经常试着找出系统中的变化并封装它。

youdao