Other people say that REM sleep is the only essential phase of sleep, so core sleep isn't necessary.
所以相对来讲，是否保证核心睡眠是没有必要的。
It is an essential phase for Chinese people to learn and use English, and it has its own internality and law.
它是中国人在学习英语、使用英语时的必经阶段，有自身的内在性和规律。
A convenient and an essential PHASE switch is included to allow for proper subwoofer signal polarity to be selected.
一个既方便又一个重要阶段，包括开关，以便适当的低音信号极性被选中。
Some of the essential work products completed at the Transition phase milestone include
在产品化阶段里程碑处完成的一些基本工作产品包括
An essential part of distributed transaction processing is the two-phase commit process.
分布式事务处理的基本部分是两阶段提交进程。
Functional Polycentricity is the most essential character and the most important developing phase of polycentric urban region.
功能多中心是多中心城市区域最为本质的特点和最为关键的演进阶段。
It is essential for GPS receiver verification to detect the phase center deviation of antenna.
天线相位中心一致性的检测是GPS接收机检定工作中必不可少的内容。
Fluid phase equilibrium data is essential for the design of supercritical fluid extraction column involving the measurement of phase diagrams for ternary mixtures.
流体相平衡数据是设计超临界流体萃取塔的关键。本文给出了涉及三元混合物相图计量的萃取塔的可行性研究和应用的一些例子。
At last, it describes the essential principle of phase compensation method zoom-fft, and presentes the computer program list of the method and illustration of calculation.
文中还介绍了相位补偿法zoom—fft的基本原理，给出了按该算法编制的计算程序和在7t17s上应用的计算实例。
In brief, competition among these groups was salutary, indeed essential to the fortunes of the the civil rights movement in its direct-action phase.
总之，竞争对于直接行动阶段的民权运动来说是大有益的，甚至可说是不可或缺的。
And it has given the design method of the essential part in the phase shifting full bridge ZVS-PWM power conversion electric circuit.
并且给出了移相全桥zvs - PW M功率转换电路的关键元件的设计方法。
We affirm our commitment to rationalize and phase out inefficient fossil fuel subsidies that encourage wasteful consumption while still providing essential energy services.
我们承诺规范并逐步取消低效、鼓励浪费的化石燃料补贴。
To find out a low cost, low resource-consuming and high efficiency process to extract essential oil from citrus peel, microcapsules along with aqueous two-phase extraction were adopted.
为寻找一条适合工业化生产的低成本、低能耗、高效率的柑桔精油提取工艺路线，该文采用微胶囊与双水相联合萃取技术提取柑桔精油。
Investigation on the oil-gas two-phase leakage in the micro gaps is essential to the calculation of gas leakage rate in the oil-injected compressors.
对微小间隙内油气两相泄漏特性的研究是计算喷油压缩机压缩腔内气体泄漏量的基础。
Objective: To probe distribution regularity of essential elements of syndrome of COPD at stable phase.
目的：探讨COPD稳定期证候要素的分布规律，为COPD稳定期中医证候的分布规律提供依据。
The competition between addition and substitution in vapour phase chloridization reaction of prolence is analyzed on the base of essential principle in chemical thermodynamics and kinetics.
对间苯二甲腈气相氯化反应过程提出了合理的假设与简化 ，从反应机理出发建立了一个动力学数学模型。
Effective water suppression, a good phase and the smooth baseline of the spectrum is essential to the follow-up statistical treatment in metabonomics.
有效的水峰抑制、良好的谱图相位和平整的基线对代谢组学的后续统计处理至关重要。
Develops graphical constructions that are essential for the interpretation of phase diagrams.
论述对解释相图十分重要的图象构建。
PWM timing is the most advanced one among all 3-phase asynchronous motor timing methods. This article introduces the essential components of PWM control loop, and the key parts of the loop.
PWM调速是当前三相异步电动机调速中最有前途的一种方法。本文在介绍了PWM调速方法的基础上，对其中的关键环节进行了较深入的研究。
PWM timing is the most advanced one among all 3-phase asynchronous motor timing methods. This article introduces the essential components of PWM control loop, and the key parts of the loop.
PWM调速是当前三相异步电动机调速中最有前途的一种方法。本文在介绍了PWM调速方法的基础上，对其中的关键环节进行了较深入的研究。
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