对方可能没有告诉他的实际背景。

Someone may not be telling you his or her true background.

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本文根据遥测系统的实际背景和特点，认为遥测系统适合采用K/N（G）模型。

The paper judged to take K/N(G) model appropriately, according to practical ground & characteristic of telemetry systems.

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图的强染色来自计算机科学，有着很强的实际背景，但确定图的强色数是非常困难的。

The strong edge coloring of graphs comes from computer science and has a very strong practical background, but it is very difficult to determine its strong chromatic number for any graphs.

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