This capacity for increased expressiveness, in fact, was essential to the Romantic style that dominated 19th century music.
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。
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.
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。
For pictures of people behaving naturally, not posing for the camera, it is essential to shoot unnoticed.
要拍摄人物表现自然、不对镜头摆姿式的照片，抓拍很关键。
It is only when the faculty of smell is impaired for some reason that we begin to realise the essential role the sense of smell plays in our sense of well-being.
"只有当嗅觉能力因为某种原因受到损害时，我们才开始明白嗅觉对健康的重要作用。
What parents do, in other words, is of deep concern to the state, for the obvious reason that caring for children is not only morally urgent but essential for the future of society.
换句话说，父母所做的事是国家所深切关注的，原因很明显，照顾孩子不仅在道德上是非常需要的而且对社会的未来至关重要。
Dunbar is not against online relationships, but he maintains that face-to-face interaction is essential for the initial creation of true friendship and connections.
邓巴并不反对线上关系，但他坚持认为，面对面的交流对于最初建立真正的友谊和联系至关重要。
Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.
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。
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。
Determining where we are in relation to our surroundings remains an essential skill for our survival.
确定我们与周围环境的关系仍然是我们生存的基本技能。
Firstly, ambition plays an essential role because it serves as a driving force for people to achieve success.
首先，志向起着至关重要的作用，因为它是人们取得成功的动力源泉。
She decided that she was going to try to just use cash for two weeks to make all of her essential purchases and see what that would do to her spending.
她决定尝试在两周内只用现金来进行所有必需的采购，看看这会对她的消费产生什么影响。
Surplus snowfall is essential for a glacier to develop.
过剩的降雪是冰川形成的必要条件。
The ability of a species to compete and adapt to a gradually changing environment is not the only ability that is essential for survival.
一个物种竞争和适应逐渐变化的环境的能力并不是生存所必需的唯一能力。
Participating in the arts is essential for child development; encouraging children to express themselves in constructive ways could help to form healthy emotional responses in later life.
参与艺术活动对儿童发展至关重要；鼓励儿童以建设性的方式表达自己，有助于在以后的生活中形成健康的情绪反应。
Getting to know where essential campus resources are—such as the student advising center, psychological services, and the tutoring center—will make your first few weeks on campus a lot easier, because you won't have to look for them while still getting used to your classes.
了解学校基础的校园资源在哪，如学生咨询中心、心理服务和辅导中心，这会让你在校园的头几周变得更容易，因为你不需要一边适应课程一边寻找这些地点。
Comprehending the way abstract ideas relate to one another is essential for reading.
对于阅读，领会抽象概念相互联系的方法是很重要的。
It is therefore essential for test management to consider the need for flexibility and capability in providing a wide range of reporting formats.
因此对于项目管理来说在提供宽泛的报告格式方面考虑适应性和接受力的需要是十分重要的。
The essential criterion for deciding whether to break use cases apart is whether their goals are different.
决定是否分隔用例的本质标准是他们的目标是否不同。
If inappropriate goods clog valuable supply lines to disaster areas, it may be difficult for essential items to be rapidly deployed.
如果不适当的货物堵塞了通往灾区的宝贵供应线，可能难以将重要的物资迅速部署到位。
Learning how to give and be grateful for everyday gifts is an essential component to finding yourself and happiness.
学会如何给予并对每一天的礼物深怀感激，这是找到自己和幸福的一个重要组成部分。
The key point to note here was that it is essential to have valid business drivers for undertaking such major initiatives to tie back to business value.
这里要记住的一个关键点是：具有有效的业务驱动因素以保证这样的主要倡议与商业价值重新紧密相关，这是最根本的。
Advising countries on issues of quality, safety, efficacy, supply management and promoting access to essential medicines for children in countries.
就儿童基本药物的质量、安全性、有效性、供应管理和促进获得等问题向各国提供咨询意见。
It will concentrate on the role of primary health care in providing access to the essential prerequisites for health.
报告将注重于初级卫生保健在提供机会获取卫生基本先决条件方面的作用。
Preventing duplicate submissions isn't very hard, and it is essential to do this for most Web apps.
阻止副本的提交并不是很难的，对于大部分的网络应用程序来说，这是理所应当的。
A free operating system is essential for people to be able to use computers in freedom.
一个免费的操作系统是人们可以自由使用计算机的基础。
This transformation is essential for China to sustain ongoing growth in productivity and realize its full economic potential.
这种转变对于中国保持生产力的增长和发挥经济潜力至关重要。
Since many programming elements depend on the context of code, it's essential for tooling to establish context.
由于很多编程元素都依赖于代码的上下文，因此使用工具建立上下文十分重要。
Since many programming elements depend on the context of code, it's essential for tooling to establish context.
由于很多编程元素都依赖于代码的上下文，因此使用工具建立上下文十分重要。
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