Those things were nice, but not necessary.
那些事情确实很不错，但不是工作所必须的。
Familiarity with the following is also helpful, but not necessary.
熟悉以下内容有助于您理解本篇教程，但不是必需的。
A depth finder is useful to locate structure, but not necessary.
找到结构，很有用，但不是需要深度仪。
Values of config file variables can be in quotes, but not necessary.
配置文件变量值能够在引号中使用，但是没有必要。
Words in brackets are optional - they are correct, but not necessary.
括号内的词是可选的-他们是正确的，但没有必要的。
It was nice to have the traditional battlegrounds, but not necessary.
能攻下传统主战场当然好，但已并不是必要。
We are evacuating the city. Exact change is appreciated, but not necessary.
他们正从他们的最后的都城撤退，准备上山，那里我是不能去的。
Vascularized bone transplantation is an ideal method, but not necessary in all patients.
血管化骨移植是理想的修复方法，但并非适合所有患者。
To get better value out of this tutorial, it is recommended but not necessary to be familiar with.
为充分利用这个教程的价值，这里推荐几个您要熟悉的术语，但不是必要的。
To get better value out of this tutorial, it is recommended (but not necessary) that you be familiar with.
为了充分利用本教程的价值，这里推荐(但不是必要的)一些您熟悉的内容。
To get better value out of this tutorial, it is recommended but not necessary that you be familiar with
为充分利用这个教程的价值，这里推荐几个您需要熟悉的术语，但不是必要的
To get better value out of this tutorial series, it is recommended but not necessary that you be familiar with.
为了从本系列教程中获得更好的价值，建议您了解以下内容，但不是必需的。
When reading the rest of this article, consider the use of "Windows" in the text to be typical, but not necessary.
阅读本文剩下的部分时，请将文中的“Windows”的使用视为典型用法，但也不是一定要这样处理。
May be we are not familiar with the music. May be some music are good for listening but not necessary for singing.
可能我们对于诗歌不是很熟悉，或许有一些歌曲适合表演但不一定能朗朗上口。
Prolonged vigorous boiling is often recommended but not necessary to destroy the fecal-orally transmitted pathogens.
通常推荐延长有力的沸腾时间，但就摧毁不了上述排泄物传播的病原体了。
To get full benefit from this tutorial, it is helpful but not necessary if you are familiar with these concepts and products
为了从这个教程中获得更全面的收益，如果您对以下这些概念和产品比较熟悉，那将一定会有所帮助，但这些并不是必须的
To get more value out of this tutorial, it is helpful but not necessary if you are familiar with these methods and software.
为了从本教程中获得更多价值，熟悉以下这些方法和软件是有帮助的，但不是必要的。
That is a whole area of expertise that is so exciting, but not necessary to get into unless you have sizable assets or a business.
这是一个如此令人激动的专业领域，但在你没有足够的资产或业务之前不必进入。
The LFS project is, obviously, based on the source files that are sufficient — but not necessary — to make up a basic Linux system.
LFS项目显然建立于那些对于构成基本的Linux系统来说充分而不必要的源文件的基础之上。
It is helpful (but not necessary) for you to be familiar with basic concepts of security such as private and public keys, signatures, and encryption.
熟悉安全的基本概念(比如私钥和公钥、签名、加密)会有帮助，但不是必需的。
The ability to use an integrated development environment (IDE) such as Eclipse and the various tools and plug-ins that go with it is helpful but not necessary.
具备使用Eclipse等集成开发环境（Integrated Development Enviroment，IDE）和各种工具及插件的能力将有所帮助，但不是必需的。
The ability to use an integrated development environment (IDE) such as Eclipse and the various tools and plug-ins that go with it is helpful, but not necessary.
具备使用Eclipse等集成开发环境(Integrated Development Enviroment,IDE)和各种工具及插件的能力将有所帮助，但不是必需的。
CONCLUSION: Compound tropicamide is shown to be an ideal drug for mydriatic optometry in juvenile patients of 12-15 years old, but not necessary for patients between 16 and 18 years old.
结论：复方托品酰胺是较大年龄(12 ~ 15岁)儿童散瞳验光的理想药物，而对16 ~18岁年龄段青少年可以直接小瞳验光。
Metaphor has been studied for over two thousand years. Traditionally it was only treated as a kind of linguistic ornament, the frosting on the cake merely, sweet tasting but not necessary.
隐喻研究有两干多年的历史，传统隐喻仅仅把它看成语言的装饰，如同蛋糕上的糖衣，美味可口，但不是必需的。
The doctors will operate if necessary—but it may not come to that.
必要时医生会施行手术，但也许还不致如此。
To be sure, he performs an impressive variety of interesting compositions, but it is not necessary for me to visit Avery Fisher Hall, or anywhere else, to hear interesting orchestral music.
当然，他演奏了多种多样令人印象深刻的有趣的作品，但我并没有必要去艾弗里·费舍尔音乐厅或其他其它地方听一场有趣的交响乐演出。
You can help your children to gain the concept that soil is not just dirt but something necessary for life.
你可以帮助你的孩子认识到，土壤不仅仅是泥土，而且是生活必需的东西。
You can help your children to gain the concept that soil is not just dirt but something necessary for life.
你可以帮助你的孩子认识到，土壤不仅仅是泥土，而且是生活必需的东西。
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