excrement mixed straw or other litter

例句：

1. 1.The dog's excrement was scattered all over the floor.
   那只狗的排泄物散落在地板上。
2. 2. The farmer used to leave his horse's excrement on the field.
   那位农民过去常常把马的排泄物留在田里。
3. 3. The scientist collected samples of the animal's excrement for analysis.
   这位科学家收集了动物排泄物的样本进行分析。