It was this that made the organization of irrigation, particularly the building of canals to channel and preserve the water, essential.

正是这点使得灌溉的统筹，特别是建造运河以疏导和保护水，变得至关重要。

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Since most planetary scientists believe that water is essential to life, the presence of jarosite means that one prerequisite for life was once present on Mars.

由于大多数行星科学家认为水是生命的基本要素，因此黄钾铁矾的存在意味着火星上曾经存在出现生命的先决条件之一。

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Since the northeast region of North American is interconnected by many streams and waterways, water transportation by vessels like a canoe was most essential.

由于北美东北部地区由许多溪流和水路相连，所以通过像独木舟这样的船只进行水上运输是最重要的。

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The United Nations reports 11 countries now are struggling to find accommodations,food, water and other essential items for their homeless populations.

VOA: standard.2009.09.13

The same four essential ingredients - flour,water,yeast and salt - can yield 10,000 different combinations.

VOA: standard.2010.07.16

He and his top engineers meet several times a week with U.S. officials, including Crear, on how to repair existing equipment, like the 100, 000-gallon-a-minute water treatment plant near Gharmat Ali, essential to restoring water injection into the Rumallah oilfields.

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"These closures are essential so that water can be removed from the city, " a statement from the Corps of Engineers' headquarters in Washington said.

CNN: Mayor blasts failure to patch levee breaches

Instead, they should consider investing in higher-rated general-obligation bonds those rated at least double-A which are backed by the full taxing power of a state, city or county, and bonds issued by essential services like water and sewers, Mr. Ciccarone says.

WSJ: Are High-Yield Munis Headed for a Fall?