他们向主干道路方向行驶。

They drove in the direction of the main street.

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实验结果表明，该方法可以很好地从SAR图像中提取各种主干道路。

The experimental results show that the presented approach can effectively extract main roads from high-resolution SAR images.

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到目前为止，全线已完成主干道路路面以外150多个勘探点的勘探工作。

Up to now more than 150 sites beyond the pavements have been prospected.

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