You need to find out the exact size and position of the image you wish to display.

你需要知道待显示图片的精确大小以及位置。

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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.

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。

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The virtual image size may also be larger or smaller than the display extent.

虚拟的图像尺寸也可能大于或者小于显示范围。

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On display there is a hologram-like miniature image of a prancing girl as well as a full-size still image of the girl at the clothing shop.

FORBES: Technology