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。
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。
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。
Regulations such as minimum operating age, restricted operating areas and compulsory classes in water safety are essential.
诸如最低操作年龄、限制操作区域和水上安全必修课等规定是必不可少的。
The goal of the rovers was to search for and analyze rocks and soils that yield clues to the planet's watery past. Water, of course, is essential for life -at least as we understand it.
它们的目的是寻找并分析火星上的石头和土壤，以寻找这个星球过去是否含水的线索，水当然是产生生命的基本条件，最少是我们理解的。
She gives life to all the living things on the earth and provides us with air, food, water and other essential things we need for living.
她给了地球上所有生物生命，给我们提供生活所必需的空气、食物、水和一切基本的需要。
In fact, the essential place of water in our diet extends to everyone - whether they want to lose weight, gain weight or stay the same weight!
事实上，水在每个人的日常饮食中的都占有重要地位——无论是他们想减肥，增肥亦或者保持原来的体重！
This means provision of the fundamental prerequisites for health: enough food, safe water, shelter, and access to essential health care and medicines.
这意味着提供健康的基本先决条件：足够的食物、安全水、住所、以及获得基本卫生保健和药物。
Hope is as essential to your life as air and water.
希望就如空气和水，是人生的必需品。
Mars is a six-month flight away, and it has surface gravity, a thin atmosphere, frozen water, carbon dioxide and essential minerals.
飞往火星需要六个月。火星具有表面重力、稀薄的大气、冰冻的水、二氧化碳和基本矿物质。
However essential, farming is not the most lucrative use of water.
无论粮食是多么必要，耕地用水的效益是不高的。
These social and environmental processes are stressing the world's arable lands and pastures essential for the provision of food and water and quality air.
在这些社会和环境进程中，世界上用于提供粮食、水和空气质量所必要的可耕地和牧场日渐减少。
As we all know, water is essential in our daily life.
我们都知道水对于日常生活的重要性。
The Plan will also help women start agribusinesses and boost their access to essential infrastructure services like transport, water and energy.
这个《计划》还将帮助妇女开办农业企业，并增加她们获得基本基础设施服务的机会，如运输、用水和能源。
This elaborate process of boiling the raw kernel in lime and water was essential.
用这沸腾的石灰水来处理早期玉米芯绝对是必不可少的过程。
WHO's work helps countries improve maternal, child and newborn health; to combat AIDS, TB and malaria; and to improve people's access to safe food, clean water, sanitation and essential medicines.
世卫组织所作的工作有助于各国改善孕产妇、儿童和新生儿健康；与艾滋病、结核病和疟疾作斗争；增进人们获得安全食品、清洁饮用水、环境卫生以及基本药物。
As 65 percent of the human body, water is essential to people.
人身体里65%是水，它是人所必不可少的。
World food Day 2002 focused on the essential role water plays in ensuring sustainable food resources for a growing world population.
2002年世界粮食日的重点是水在确保向不断增长的世界人口提供可持续性的粮食资源中所发挥的至关重要的作用。
Access to safe water, proper sanitation and health services is essential to prevent it from spreading to those displaced on roads, residing in temporary camps and living in established communities.
获得安全饮用水、适当的卫生条件以及卫生服务是最基本的，可以防止疾病扩散到在道路上颠沛流离的人们、那些住在临时营地的人们以及生活在设立社区的人们。
Workforce, information and financing; essential vaccines, medicines and technologies; and basic survival needs e.g. sanitation, nutrition, potable water, vector control and tobacco control.
世卫组织卫生服务支柱(如劳动力、信息和资金)；基本疫苗、药品和技术；以及基本生存需求(如卫生、营养、饮用水、病媒控制和烟草控制)。
Fresh water is essential for life, with no substitute.
淡水是生命的必需品，而且无可替代。
Like food, air, and water, energy is essential to human existence.
像食物、空气和水一样，能源在人类的生活中必不可少。
And lifestyle changes like exercise, drinking more water, getting adequate sleep and not missing meals are essential.
另外，作息调整诸如多锻炼，多喝水，充分的睡眠，三餐规律等都是必要的。
Essential primary health care; minimum essential and nutritious food; sanitation; safe and potable water; and essential drugs are included in the core content.
这项核心内容包括基本初级卫生保健、最基本和有营养的食物、卫生条件、安全的饮用水，以及基本药物。
Essential primary health care; minimum essential and nutritious food; sanitation; safe and potable water; and essential drugs are included in the core content.
这项核心内容包括基本初级卫生保健、最基本和有营养的食物、卫生条件、安全的饮用水，以及基本药物。
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