比方说，您的应用程序要求一个容器能够垂直堆叠显示对象而不在其间留空隙。

For instance, say your application requires a container that vertically stacks display objects but without any gap in between.

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序列图主要用于按照交互发生的一系列顺序，显示对象之间的这些交互。

The sequence diagram is used primarily to show the interactions between objects in the sequential order that those interactions occur.

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此外，显示对象所需的内存根据正在执行的操作而变化。

Additionally the memory needed to represent an object can vary depending on the action being performed.

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How do we typically print things, we convert them to strings.

我们一般是怎么显示对象的呢？,对，把它们转换为字符串。

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