水通过土壤的渗透过程为植物提供了水分。

The ___percolation of water through the soil provides moisture for the plants.

这个流行趋势在城市年轻人中渗透传播用了几个月时间。

The ___percolation of this fashion trend among urban youth took several months.

研究人员通过实验观察了水在岩石中的渗滤过程。

The researchers observed the ___percolation of water through the rock samples in their experiment.