They fly back when spring comes. This called migration.

当春天来临时它们会飞回原来的地方。这中移居。

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Then two conventional envelope migration compensation algorithm was introduced, on this basis, a new algorithm called frequency domain correction was proposed.

接着介绍了两种常规的包络走动补偿算法，在此基础上提出了一种新的算法称之为基于频域校正的包络补偿算法。

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Then two conventional envelope migration compensation algorithm was introduced, on this basis, a new algorithm called frequency domain correction was proposed.

接着介绍了两种常规的包络走动补偿算法，在此基础上提出了一种新的算法称之为基于频域校正的包络补偿算法。

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