氧气在细胞呼吸的新陈代谢过程中是必不可少的，它能使细胞有效地从有机食物中获取能量。
Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.
所以我们一直在讨论营养，环境中的元素对于生物体的发展，健康的生活和繁殖是必不可少的。
So we've been talking about nutrients, the elements in the environment that are essential for living organisms to develop, live a healthy life, and reproduce.
人们常说，陈词滥调是作家可能犯下的最严重的错误，但对于一个口头吟游诗人来说，它们是必不可少的。
It's said that clichés are the worst sin a writer can commit, but to an oral bard, they were essential.
当然，在节日期间，这种植物是必不可少的。
监测、监督和后勤支援是必不可少的。
Monitoring, supervision and logistical support are essential.
然而，预防和治疗机会感染仍然是必不可少的。
Yet the prevention and treatment of opportunistic infections remains essential.
而在所有已复制服务器上执行任务是必不可少的。
It was necessary to perform tasks on all replicated servers.
在这种情况下，使用强大的调试工具是必不可少的。
In such cases, it is essential to have strong debugging tools.
基本类型是必不可少的；它们为接口定义提供了构件块。
The fundamental types are essential; they provide the building blocks for our interface definitions.
必需脂肪酸对于构建和维持细胞是必不可少的。
Essential fatty acids are vital for building and maintaining brain cells.
定期状态更新，例行会议和明确后续行动是必不可少的。
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。
This elaborate process of boiling the raw kernel in lime and water was essential.
虽然它们是必不可少的，但是这些服务对手机来说并不是唯一的。
Although I find them indispensable, the services aren't unique to a mobilephone.
对于各种混乱，尿不湿是必不可少的，尽管他们早已过了那个年龄。
Baby wipes, even after they are past using diapers, are indispensable for all kinds of messes.
知识份子和艺术家对在文化和人民之间建立理解方面是必不可少的。
Intellectuals and artists are essential to foster understanding between cultures and people.
饱和脂肪是必不可少的，如果没有得到它们，你的身体会为它们尖叫。
Saturated fats are essential and your body screams for them if it doesn't get them.
你要懂得餐桌礼仪，比如刀叉的使用，这些在西方宴会中是必不可少的。
You are expected to have knowledge of table manners such as what folk or knife to use as these are essential in western dining.
对于刚才介绍要发生的活动来说，强大的方法指导是必不可少的。
For the activities just described to take place, strong methodological guidance is an imperative.
你必须让公司觉得对于公司将来的成功来说，你的才能和贡献是必不可少的。
The company must view your talents and contributions as essential to the company's future success.
因此，对于依赖安全性的软件或应用程序，审计设施是必不可少的。
So having a facility for auditing is kind of a must for a security-based software or applications.
这一调查结果表明，正常运转的载脂蛋白对于对付小型吸入粒子是必不可少的。
This finding suggests that properly working apolipoproteins may be essential for coping with tiny inhaled particles.
拥有测试应用程序环境—而不仅仅是应用程序—的能力是必不可少的。
Having the ability to test the application environment — not just the application — is a necessity.
然而，由于资金通常都是最缺乏的资源，所以改善性能是必不可少的。
However, because money is typically the scarcest of resources, tweaking for performance is inevitable.
他说，这是人类的根本特性，它对于保持我们身体功能，维持健康是必不可少的。
He says it's fundamental to being human; it's essential to the way our bodies function and keeping them healthy.
首先，考虑对中枢神经的报偿机制的最新研究进展的了解是必不可少的。
First, it is imperative that recent advances in the understanding of neural reward pathways be considered.
如前所述，按顺序的输入对于合并扫描联接是必不可少的，但其无需嵌套循环联接。
As previously stated, ordered input is essential to a merge scan join, but it is not required for nested loop joins.
第二部分谈到了社交问题，当人们邂逅之时，讨论没有读过的书往往是必不可少的。
The second section describes social encounters during which it becomes essential to talk about unread books.
要设计出兼顾功能性和美感的UI，当然经验和敏锐的直觉是必不可少的。
Certainly experience and good instincts are necessary to create a UI which is both highly functional and aesthetically pleasing.
要设计出兼顾功能性和美感的UI，当然经验和敏锐的直觉是必不可少的。
Certainly experience and good instincts are necessary to create a UI which is both highly functional and aesthetically pleasing.
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