与表格单元格、行和列一样，当您未明确设置图像大小时，浏览器需要执行计算来显示图像，这会降低处理速度。

As with table cells, rows, and columns, when you don't explicitly set the image size, the browser needs to perform calculations to display the image, which slows down processing.

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设想，如果可以这样处理行为——假设您可以像设置其背景颜色那样轻松地将行为分配给一个表的单元格，比如是展开还是折叠，是突出显示还是滚动。

Imagine if you could do the same with behaviors — if you could just as easily assign behaviors to a table cell, like expand and collapse, highlight or scroll, as you could set its background color.

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图1显示了一个装了Ethernet shield、cat 5 Ethernet及电源电缆的arduino微处理器，此图可让您对此单元的规模有一个大致的了解。

Figure 1 shows an Arduino microprocessor with an Ethernet shield mounted and a cat5 Ethernet and power supply cables attached, which gives you an idea of the size of the unit.

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