Such measures are desirable, if not essential.
这些措施即使不是必要，也是可取的。
Although not essential, some prior knowledge of statistics is desirable.
统计学的知识虽非必要，但最好是学过一点。
Money is not essential to happiness.
金钱对于幸福并非必不可少。
Catching to fashion is not essential to the happiness of all women.
赶时髦并不是对所有妇女的幸福都重要。
不过这并不是最重要的。
English ability is helpful but not essential.
能英文交流为佳，但并非是必需的。
Manager's request is frequently not essential.
主管的要求，经常是没必要的。
Words not in bold are useful, but not essential.
非黑体单词有用，但不是最基本的。
See now you still feel dynamic balance is not essential?
看到现在你还觉得动平衡可有可无吗？
It's not essential to understand each word when skimming.
理解每个单词是没有必要的。
Working knowledge of MRI highly desirable but not essential;
最好掌握MRI，但不是必要条件；
Note that the use of the Velocity in this context is not essential.
注意，在本文中，Velocity的使用并不是必不可少的。
Some knowledge of quantum mechanics would be helpful but not essential.
掌握一些量子力学知识当然有帮助，但这并不是必须的。
Information that's not essential is deleted and what's left is compressed.
不重要的信息被删除，其余的被压缩。
For deletions this is not essential, but for other operations it can be important.
对于删除来说这并不重要，但对其他操作来说可能是重要的。
Marketing is not essential to human survival; hence your services may not be either.
营销不是人类生存的关键，因此你的服务也不是人类生存的关键。
Bachelor's degree above, preferable major in Chemical and Finance, but not essential.
大学本科学历，最好有化工，财务等专业背景，但专业要求不是必须的。
Bachelor's degree above, preferable major in Chemical and Finance, but not essential.
大学本科学历，最好有化工，财务等专业背景，但专业要求不是必须的。
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