选举制度是维持议会民主所必不可少的。
Elections are essential for the sustenance of parliamentary democracy.
汽车已成了我们生活中必不可少的一部分。
帮助工人去适应的政策将是必不可少的。
但帮助工人去适应的政策将是必不可少的。
我同意提供更多的公园和体育设施是设计新城镇时必不可少的元素。
I agree that providing more access to public parks and sports facilities is an essential element when designing a new town.
为了获得成功的结果或回报，一定程度的风险几乎总是必不可少的。
In order to achieve a successful outcome or reward, some level of risk is almost always 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。
Regulations such as minimum operating age, restricted operating areas and compulsory classes in water safety are essential.
塞内加尔首都主要医院的精神科医生将其视为治疗过程中必不可少的一部分。
Psychiatrists in the Senegalese capital's main hospital see it as an essential part of the healing process.
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.
两者都是必不可少的，没有一个是优于另一个的；它们互不冲突反而相辅相成，各有其本身的职权范围。
Both were essential and neither was superior to the other; they were not in conflict but complementary, each with its own sphere of competence.
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.
在整个食品生产周期中，能量是一种必不可少的资源，据估计，生产一卡路里的食品平均需要7-10卡路里的投入。
Energy is an essential resource across the entire food production cycle, with estimates showing an average of 7-10 calories of input being required in the production of one calorie of food.
我们似乎都同意大学教育是极好的，但奇怪的是，当我们看到家庭在这个本应是必不可少的好东西上投入如此之多时，我们却感到担忧。
We all seem to agree that a college education is wonderful, and yet strangely we worry when we see families investing so much in this supposedly essential good.
灯笼是中国新年等重要节日中必不可少的装饰。
Lanterns are necessary decorations during important festivals such as the Chinese New Year.
当然，在节日期间，这种植物是必不可少的。
他们是候鸟必不可少的觅食和繁殖地，十分重要。
They are important and necessary feeding and breeding grounds for migratory birds.
首先，诗歌是学习中国传统文化必不可少的一部分。
First of all, poetry is a necessary part of learning traditional Chinese culture.
智能手机已经成为我们日常生活中必不可少的一部分。
Smart phones have become an essential part of our daily lives.
事实上，这种更高级别的表现力对于主导19世纪音乐的浪漫主义风格来说是必不可少的。
This capacity for increased expressiveness, in fact, was essential to the Romantic style that dominated 19th century music.
教授提到了两个仆人之间的对话，以解释剧作家如何建立起一部好剧本中必不可少的场景。
The professor mentions a conversation between two servants in order to explain how playwrights develop the obligatory scene of a well-made play.
也许首先展开的不是在经济或社会层面上的斗争，而是为占有对生命本身必不可少的空气而斗争。
Perhaps struggle unfolds first, not at an economic or social level, but over the appropriation of air, essential to life itself.
对于人们来说，发明是至关重要、必不可少的，正如灵魂对人们来说是不可或缺且意义重大的一样。
Invention is momentous and fundamental to people what the soul is vital and significant to us.
对前几代人来说，大学是摆脱父母控制的一个决定性时期，同时同龄人和长者的支持与指导也是必不可少的。
For previous generations, college was decisive break from parental control; guidance and support needed help from people of the same age and from within.
为实现我们所寻求的经济增长，我们需要开启一个能使我们的经济在未来数十年中获得动力的必不可少的增长源泉。
To achieve the economic expansion we all seek, we need to unlock a vital source of growth that can power our economies in the decades to come.
如果你是要去露营、投宿招待所、梳化旅行，这个旅行毛巾是比必不可少的。
The PackTowl is indispensible if you're camping, hosteling, or CouchSurfing.
监测、监督和后勤支援是必不可少的。
Monitoring, supervision and logistical support are essential.
字体已然成为设计师必不可少的素材。
Fonts have already been among the essential materials used by designers.
课程协作是协作学习环境中必不可少的特性。
Course collaboration is an essential feature in a collaborative learning environment.
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.
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