sapropel layer
... 腐泥，腐植泥 sapropel 腐泥层 sapropel layer 腐泥煤 sapropel-peat ...
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软土是指以水下沉积的软弱粘性土或淤泥为主的地层，有时也夹有少量的腐泥或泥炭层。
The soft soil refers to the soft clay deposited under water or mud-based formation, sometimes with a small amount of rot folder mud or peat layer.
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