它允许我们简化并关注于少量的必不可少的事物。
It'll allow us to simplify and focus on less - on the essential things, the things that matter most.
很不幸，在日常生活中疼痛虽然令人很不悦但却是必不可少的。疼痛会警告人们那些可能会伤害到自己的事物来保护他们。 （根据原文的意思疼痛是生活的必需品的而不是避免的，也就是说疼痛本来是对人有很多好处的，你的翻译意思上有点不对。）
PAIN, unfortunately, is a horrible necessity of life. It protects people by alerting them to things that might injure them.
这种将事物划分成必不可少的内容与可有可无的形式的做法增强了UML的可管理性。
This partitioning into essential content and dispensable form enhances UML's manageability.
不是因为你关注你的事物是重要的，而是因为流动的行为对生命来说是必不可少和极其重要的。
Not because the objects of attention are important, but because the act of flowing is essential to life.
表示属于某事物的要素或特点是“主要的，中心的，实质的，必不可少的”。
“特定的措辞是必不可少的，”乔治·奥威尔说，“如果人们要命名事物而又不想唤起关于它们的心理意象的话。”
"A certain phraseology is obligatory," said George Orwell, "if one wants to name things without calling up mental images of them."
测试与测量是人类认识自然界客观事物并对这些事物的若干现象进行量化从而深入认识其本质的必不可少的手段。
Testing and measure are indispensable means for human beings to understand the objective things in the nature and to quantify the phenomena of these things in order to see through the essence.
测试与测量是人类认识自然界客观事物并对这些事物的若干现象进行量化从而深入认识其本质的必不可少的手段。
Testing and measure are indispensable means for human beings to understand the objective things in the nature and to quantify the phenomena of these things in order to see through the essence.
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