在开始参观之前，让我给大家简单介绍一下这座了不起的建筑的设计。

Before starting the tour, let me give you a brief introduction about the design of this amazing building.

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让我先简单介绍一下商场的布局。

First, I would like to show you the layout of this arcade.

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为了让您能更好地理解refresh()方法，我先来简单介绍一下我所使用的自定义的数据结构。

You'll understand the refresh() method better with a brief explanation of the self-defined data structures that I am using.

youdao

为了让您能更好地理解refresh()方法，我先来简单介绍一下我所使用的自定义的数据结构。

You'll understand the refresh() method better with a brief explanation of the self-defined data structures that I am using.

youdao