抽象不仅仅是隐藏细节；它是关于创建问题域的清晰简洁的模型。

我们不应当如梦游一般地行事和言语。

别让别人的意见淹没了你内心的声音。

In computer science, we often deal with problems that are too complex to solve directly, so we break them down into smaller, more manageable parts.