实验结果表明，测量古径迹投影长度是揭示古地温状况的一种有效而简单的方法。

The experimental results show that measuring fossil track projected lengths is more powerful to reveal palaeotemperature and is very simple.

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您可以通过保证范围（每个投影长度单元对应多少像素）在 x 和 y 方向上相同（或接近）来防止这种情况发生。

You can prevent this by making sure the scale (how many pixels correspond to each projected unit of distance) is the same (or close) in both the x and y directions.

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并且简单介绍了基于最小描述长度(MDL)原理的信源数目估计方法以及基于子空间投影技术的MU SIC算法。

Furthermore the source number estimation method based on theory of MDL and the algorithm of MUSIC based on sub-space projection technique are also introduced briefly.

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