作者使用图形辅助来说明和扩展文本中的概念，因为图形是描述关系和阐明联系的另一种方式。

Authors use graphic aids to illustrate and expand on concepts taken up in the text because graphics are yet another way of portraying relationships and clarifying connections.

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尽管“干杯”很受欢迎，但它被认为是一种非正式的表达感谢的方式——这也就明确说明了什么时候使用它是最合适的。

"Cheers", despite its popularity, is considered an informal way to say thank you—and this is a definite clue as to when you can best use it.

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本文中的屏幕图像和说明主要使用后一种方式。

The screen images and instructions in this article focus on the latter.

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