As he pondered over the dimly discernible piece of news he had received he smelled the smell of river water that has been dyed a transparent black by humus soil.

他琢磨着那一丝缥缈的消息。他闻到了一股被腐植质染成清黑色的河水的气味儿。

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It was found that the humus layer in black soil region was thick in north and thin in south, which was due to the climatic condition and soil-forming process.

研究发现，深厚黑土主要分布于黑土区北部，中厚与薄层黑土则分别集中在黑土区的中部和南部，这主要与黑土分布区的气候条件和黑土的成土过程有关。

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