It is fine to scan your whole code base for opportunities to use these features, but it is not essential.
在整个代码库中寻找使用这些特性的机会是不错的做法，但这不是必需的。
It is not essential to build a storage or impounding reservoir if the water can be stored in the ground.
如果能将水储存在地下，就没有必要建造水库或蓄水池。
But it is not essential that this proof of the truth should constitute the first introduction to the idea.
然而，这并不是说，我们传授一个概念时，就必须先证明它的真实性。
While it is not essential for an Intranet to have a physical connection into the Internet, the benefits can often outweigh the risks.
尽管对于内特网而言不必一定与因特网有物理联接，但是联接的好处经常大于风险。
The sales information gets updated constantly in the sales table, but it is not essential that the executives get up-to-the-second information.
销售信息经常更新到sales表中，但这不是说经理们必须得到最新的信息。
But we think, when using UDP protocol, it is not essential to make affirmation and retransmission, so we can adopt random access schemes without retransmission.
但我们认为，当使用UDP协议进行随机接入时，没有必要确认和重发数据包，可以采用无重发的随机接入方式。
So when I contemplate a physical object I'm aware that it is necessarily extended and I am also aware that it is not essential to its being that it be a thinking thing.
当我思考一个实体对象的时候，我会意识到它的必然延展，且其精髓并不是一个思考的物质。
It is essential to build up the military option and show that this is not a bluff.
重要的是准备军事解决途径来证明这并不是虚张声势。
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。
They do not see it as "real teaching", especially as it does not seem to involve the "work" they have learned to believe is essential to learning.
他们不认为这是“真正的教学”，尤其是因为它似乎不涉及他们认为对学习至关重要的“工作”。
Working hard is not a guarantee of great success, but it is among the essential requirements.
虽然努力不能保证成功，但它是最基本的要求之一。
these laggards include America. It is not just infant mortality, an essential indicator, in which America lags behind (see chart).
美国不仅仅因为健康指标中一个基本指标，婴儿死亡率，才落后的（见图表）。
However Michael reiterated that though it might be hard to accept that a devloper or a tester does not have anything to do, it is essential to follow the WIP rule else the pull system would not work.
然而Michael重申，虽然要接受一个开发人员或者测试人员无事可做这一情况可能很难，但遵守WIP规则是必不可少的，不然拉动系统就不能正常运作了。
The “essential relationship” will not stay essential for long unless Mr Cameron is willing to spend a bit more on the things that underpin it.
“非常重要的关系”将不会延续很长时间除非卡梅伦（Cameron）愿意在巩固这种关系的事情上花费更多。
But even if weighing costs against benefits does not entirely answer the question of what should be done about climate change, it is an essential part of the answer.
但是即使将成本和收益进行衡量没有完全解答我们面对气候变化应该做什么的问题，那也是答案中必不可少的一部分。
Providing the ability to use a keyword argument is not essential, but it can make code with lots of arguments a lot clearer, and is not much extra work.
提供使用关键字参数的能力不是必需的，但它可以使带有许多参数的代码变得清楚许多，而且不需要大量的额外工作。
And while logical decomposition is often essential, it is not sufficient for system modeling.
虽然逻辑分解常常是必要的，但是对系统建模来说是不够的。
That is because it does not include two Level 2 process areas, which cover essential best practices for project implementation.
这是由于它没有包括2级的两个过程领域，而它们包含了项目实现中基本的最佳实践。
While the parties have shifted their attention toward deficit reduction and spending cuts, it is essential that the nation does not lose sight of these much more fundamental problems.
当两党向削减赤字和削减开支转移注意力时，有一点非常重要，那就是国家没有忘记注意这些更为基层的问题。
The serializer is not technically part of the XSLT processor, but it is essential for practical use.
从技术上看，串行化器并不是XSLT处理器的一部分，但它在实际使用中是必不可少的。
Because some species are protected and others are not, it is essential that wildlife crime investigators determined the exact species of their victims.
因为有些物种受保护有些不受，对野生动物罪案调查者来说确定受害者正确的物种是很关键的。
It seems that this is a non-essential project and maybe should not be included at all.
在我看来这并不是一个重要的项目，压根就不应该包含进来。
The UK premier admits that this "will not always be a comfortable discussion but it is in my view an essential one".
这位英国首相承认，这“不会总是一个舒服的讨论，但在我看来是十分必要的。”
Painful austerity is an essential condition for lasting growth, but it is not enough on its own.
为了维持经济增长，痛苦的紧缩非常重要，但是仅仅是紧缩政策还不够。
If mobile TV is not used enough to make money from advertising, it is also not essential enough to persuade lots of people to pay.
如果手机电视不能从广告商那边赚取足够多的钱，那么说服很多人去购买这种手机也就没什么必要了。
It provides a blueprint for the inter-team communication that is essential not only for meeting business goals, but also for performing effective engineering.
它为团队之间的交流提供了一个蓝图，这种交流不仅仅为了满足业务目标，同时也是有效的执行工程的需要。
The everyday act of breast-feeding is not only reproductively essential, it gives pleasure to both mother and child: perhaps the most innocent pleasure of which humans are capable.
哺乳的日常行为不仅是生殖的必要，它赋予母亲和孩子以快乐：也许是人类所能的最纯洁的快乐。
It is not very interesting, but it is essential when trying to determine the impact of a change.
它也许不是那么有趣，但是很重要——当需要确定一个更改会产生那些影响的时候。
In general, this modularity is necessary for programmers because it enables easy debugging and coding, but once the application is written, this modularity is not essential — or needed.
通常，这个模块化特征是程序员所必需的，因为通过其可以方便地进行调试和编码，但编写了应用程序之后，此模块化特征就不再重要了——或不再需要了。
In general, this modularity is necessary for programmers because it enables easy debugging and coding, but once the application is written, this modularity is not essential — or needed.
通常，这个模块化特征是程序员所必需的，因为通过其可以方便地进行调试和编码，但编写了应用程序之后，此模块化特征就不再重要了——或不再需要了。
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