在第四段中，作者认为水是生命所必需的。
In the fourth paragraph, the writer thinks that water is necessary for life.
水是维持生命所必需的物质之一。
构成这些生命所必需的元素需要几十亿年的时间。
Building up the elements needed for life this way takes billions of years.
背后的氧气思想源于消费者洞察，移动电话是'生命所必需的'。
The thinking behind O2 stemmed from the consumer insight that mobile phones are 'essential for life'.
然而，经过几小时的学习后，你就能懂得挽救生命所必需的知识了。
However, after a few hours of study you will manage to know enough to save other people's lives.
新陈代谢维持生命所必需的，发生于存活细胞中或生物体中的物理和化学过程的总和。
The complex of physical and chemical processes occurring within a living cell or organism that are necessary for the maintenance of life.
另外，红树属树木为这些生物提供了维持生命所必需的营养来源，温和的气候也提供了有利条件。
Also, the mangroves here are a vital source of nutrients for the organisms, and the temperate climate helps.
得益于之前的那些漫游车及轨道探测器所做的工作，研究人员已经了解到火星在远古时代存在一些人们认为生命所必需的成分。
Thanks to the work of previous rovers and orbiting probes, researchers already know that ancient Mars had many of the ingredients thought necessary for life.
与迅速衰老相关联的自由基很容易与包括维持生命所必需的DNA和蛋白质发生反应，而破坏这些DNA和蛋白质，就可能会损伤或杀死细胞。
Free radicals, linked to rapid aging, are highly reactive with other molecules, including vital DNA and proteins, the destruction of which can damage or kill cells.
由于水资源是维持生命所必需的物质，其安全保障问题迫在眉睫，因此亟需建立起水安全评价体系及水安全保障体系，通过系统的方法和技术认清水安全形势，探讨保障水安全的措施和方法。
As water resource is the indispensable material in life and its security is emergent, the development of water security evaluation and assurance system is desiderated so that we can recognize the.
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。
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.
我们先来简单介绍JSF请求处理生命周期，这是理解本文所附的示例代码所必需的。
This starts with a brief description of the JSF request processing life cycle, containing all you need to know to understand the sample code included with this article.
ApplicationManagement模块详细描述了在整个应用程序生命周期的所有阶段对其进行管理所必需的流程。
The application Management module details the processes required to manage an application through all phases of its application lifecycle.
立即诊断和适当处置是避免威胁生命的并发症和维持病人视力所必需的。
Prompt diagnosis and appropriate management of subperiosteal abscess are essential to not only avoid life threatening complications but also preserve visual acuity of the patient.
氟是机体生命活动所必需的微量元素之一，具有多方面的生理作用。
Fluorine is one of the necessary trace elements for the body and it has many physiological effects.
硒是人类生命活动所必需的微量元素。
The selenium elemental is a titled elemental that necessary to the life activity of human beings.
它充实了在引进大型应用软件时用生命周期法建立工厂管理信息系统所必需做好的各项工作。
It expands the work required of the method of life cycle when the management information system of a factory is set up by introducing a large application software.
从微生物的组成、生长及繁殖等方面阐述了氮是微生物生命活动所必需的元素。
From microorganism's composition, growth and reproduction and so on it is elaborated that the nitrogen was the essential element to microorganism vital activity.
人类也开始要求更多的有机农产品不仅富含人类维生所必需的维生素和矿物质，并且作为一个提升的生命拥有灵魂来交融。
Humans are also beginning to demand more organic produce that are not only filled with the vitamins and minerals that one may need to sustain life, but also soul to commune with as an ascending being.
糖皮质激素为维持生命所必需，对人体的生理作用是多方面的。
Glucocorticoid to sustain life are necessary to the biological role is multifaceted.
线粒体基因组仅编码生命源和功能所必需的遗传信息片断。
Mitochondrial genomes encode only a fraction of the genetic information required for their biogenesis and function.
线粒体基因组仅编码生命源和功能所必需的遗传信息片断。
Mitochondrial genomes encode only a fraction of the genetic information required for their biogenesis and function.
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