ABSOLUTE ALTITUDE , The actual distance the aircraft is above the ground.

绝对高度, 飞机离地面的实际距离.

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The actual distance learning system based on Web has some drawbacks.

但是目前的基于Web的远程教学系统存在着一定的不足.

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The actual distance is only two kilometres.

实际距离只不过2千米.

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