Maps (on paper or on the screen) are flat surfaces; they require a transformation from the curved surface of the earth to the flat plane: a map projection.

纸上或屏幕上的地图是平面的；它们需要从地球的曲面向平面进行转换：地图投影。

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Our everyday experience might itself be a holographic projection of physical processes that take place on a distant, 2d surface.

我们的日常体验可能只是发生在遥远的二维表面上的物理过程的全息投射。

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The size of the image can be adjusted simply by modifying the distance between the projector and the projection surface; the resulting image remains uniformly clear.

通过改变投影仪和投影片表面的距离，图像大小也能做简单的调整，调整后的画面仍然保持清晰。

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Eighty percent of the Recovery Act funds targeted for surface transportation was spent out -- the projection was we would have only spent out 55 percent at this point.

WHITEHOUSE: Meeting of the President's Council on Jobs and Competitiveness | The White House