At the time, a number of California's local water agencies were proposing a different approach to the state's perennial water problems.
当时，加州当地一些供水机构提出了解决常年存在的水问题的一个不同的解决方案。
Under moderate water level fluctuations, the species diversity will increase, and perennial water level fluctions play an important role in community succession.
长期的水位变动在植物群落演替上扮演重要的角色。
The first is the water surface, which houses the Restroom and kitchen, because these two parts of perennial water or often wet, extremely important waterproof nature, don't let down.
首先是流水面，即房屋的洗手间和厨房，因这两个部位常年有流水或经常潮湿，（屋顶）防水天然极其重要，万万不要掉以轻心。
It holds water remarkably well and helps feed the perennial streams on which they and the animals that live on the mountain rely.
铝土能极好地保持水分，还能使他们和住在大山中的动物赖以为生的溪流常年保持流淌。
Mountain water transfer, beautiful scenery, quiet environment, a pleasant climate, with "perennial clouds, summer without summer, winter snow Feng, Chunhua late" feature.
山环水转，风景旖旎，环境清幽，气候宜人，具有“常年云雾，夏季无夏，冬季雪丰，春花迟发”的特点。
There is a perennial shortage of water in this area.
这地区长期缺水。
Helophyte a perennial marsh plant that has its overwintering buds under water. An example is bulrush (Typha).
沼生植物：多年生的沼泽植物，具有水下越冬芽。例如芦苇(香蒲)。
Because of water level limitation, the Jinghong reservoir has to be operated at a low level during a perennial flood period.
由于受水位限制，景洪水电站在常年洪水时，水库必须在低水位运行。
Helophyte a perennial marsh plant that has its overwintering buds under water.
沼生植物：多年生的沼泽植物，具有水下越冬芽。
In this paper, we deduced the formula for the length calculation of drainage hole in which the water could not be frozen through perennial soil.
推导出通过多年冻土段不发生冻结泄水洞长度的计算公式。
If you decide to move beyond perennial plants that need only natural occurring water, you'll open up another large set of options for your landscape.
如果你决定走出厂常年自然发生，需要用水，你打开另一个大套供你选择的景观。
Helophyte a perennial marsh plant that has its overwintering buds under water.
的沼泽植物，具有水下越冬芽。
Helophyte a perennial marsh plant that has its overwintering buds under water.
的沼泽植物，具有水下越冬芽。
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