1. biological pollution of soils 
   土壤生物污染
2. flow through unsaturated soils 
   非饱水土渗流
3. rheological behaviour of soils 
   土流变性能
4. This material soils easily. 
   这种料子不禁脏.
5. a retentive memory; soils retentive of moisture. 
   保持记忆；保持湿润的土地。

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