porous reservoir model

例句：

1. 1. The soil is porous enough toallow water to pass through easily.
   土壤是多孔的，可以轻易地让水通过。
2. 2. The fabric is porous,allowing air to circulate freely.
   这种布料是多孔的，允许空气自由流通。
3. 3. Thesponge is porous, absorbing a lot of liquid.
   海绵是多孔的，能吸收很多液体。