A viewport is an artificial coordinate system that is translated into the physical coordinate system of the image.

viewport是一个人造的坐标系统，可以转换成图像的物理坐标系统。

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Therefore, a child added to a container is not placed in the local-coordinate system of a container, but in its content pane, which has its own coordinate system.

因此，向容器添加的子控件不是放置在容器的局部坐标系中，而是放置在它的内容面板中，内容面板拥有自己的坐标系。

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You need some extra methods to convert that item from its local-coordinate system to its content-coordinate system.

您需要使用其他方法将该子元素从局部坐标系转换到内容坐标系。

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How do the components of A in the new rotated coordinate system relate to the components of the old coordinate system?

在旋转后的新坐标系中 A 的分量,和原始坐标系中 A 的分量有什么关联呢

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Before Galileo began running balls down an inclined plane to measure changes in velocity, and before Descartes developed his coordinate system, the German Jesuit Christoph Clavius, designed the mathematics curriculum for the major universities of Europe.

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This is only about how we coordinate that system.

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Bombardier also teamed up with another firm to develop a security system that will coordinate and transmit video footage taken inside the traincars with footage taken by cameras in stations and along the routes.

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