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To achieve this effect, designers often create a container with a transparent PNG-image as background and place the content inside the container - with equidistant padding on all sides of the box.

要达到这个效果，设计者们通常会创建一个容器，用一张透明的PNG图像作为其背景，并把内容放在这个容器中。

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Listing 1 shows a simple container type, Box, which supports put and get operations.

清单1展示了一个简单的容器(container)类型Box，它支持put和get操作。

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My mom has a Keurig machine, and a box of K-cups is the size of a small toaster oven and besides the box, every single cup generates a wasted plastic container and foil lid.

FORBES: The Rolex of Coffee Makers - How Swiss-Made Precision Changed My Life