北雁南飞，去往南方芦苇丛生的湿地。
It brought the wild duck back to the reedy marshes of the south;
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.
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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