用黑色毡头笔画出基本轮廓(见图4)。

Draw the basic Outlines in black felt-tip pen (see FIG. 4).

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用黑色毡头笔画出基本轮廓(见图4)。

Draw the basic Outlines in black felt - tip pen (see FIG. 4).

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燕山运动造成了本区基底构造的基本轮廓—北东向雁列式隆起与拗陷。

The fundamental framework of geological structure of bedrock in Beijing plain was created due to Yanshan Movement in this region.

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