这类植物通过生长出长长的主根来适应环境，这些主根可以向下渗透，直达地下水提供的充足水源。
These have adapted to the environment by the development of long taproots that penetrate downward until they approach the assured water supply provided by groundwater.
不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。
Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.
上面的盆子装满土并在底部安装向下渗透养分的管子。
The first basin would be filled with soil and a drain would be located at the bottom to allow leach of nutrients.
当水向下渗透时，水会与土壤中的有机物质和矿物质溶解，并将它们带进深层。
As water percolates downward, it dissolves organic matter and minerals from the soil and carries them to deeper layers.
我们仍然需要知道这种消费市场到底有多大，以及消费者对奢侈商品的需求向下渗透到社会的什么层次。
We still need to know how large this consumer market was and how far down the social scale the consumer demand for luxury goods penetrated.
雨水向下流，流到不渗透岩石层，接着，向旁边流到河流穿过岩石层的那个地方。
Rainwater flows down to the non-porous layer of rock, and then it flows sideways to where the river cuts through the rock layers.
当水到达潜水面以下的饱和带时，它就缓慢地向下和侧向渗透。
When water reaches the saturated zone beneath the water table, it oozes slowly downward, and laterally.
当水到达潜水面以下的饱和带时，它就缓慢地向下和侧向渗透。
When water reaches the saturated zone beneath the water table, it oozes slowly downward, and laterally.
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