这种做法缺乏理论依据：所有股市的预期回报率理论上是一样的。
This is without theoretical justification, which points to expected returns in all stock markets being the same.
科学家们趋向认为它的背后的科学是相互冲突的，或者宁愿是缺乏理论依据的。
Scientists tend to be conflicted about the science behind it, or rather the lack thereof.
神经网络具有自学习，自适应，并行处理的能力，但结构的选择缺乏理论依据。
Neural network have the abilities of self-learning, adapt and parallel management, but the structural selection lacks academic bases.
但目前三维复杂槽型铣刀片的种类较少，并且其槽型也多由经验定型，缺乏理论依据。
The groove is modeled by experience and there is a lack of theory basis.
冠部设计是PDC钻头总体设计的一个重要组成部分，过去一直是凭经验设计，缺乏理论依据，随意性较大。
The design of bit profile is an important part of PDC bit design, and it is always made by designers on the basis of their experience.
目前对普通车床床身的设计缺乏有效的理论依据，床身的结构设计不尽合理。
Now lathe bed lacks effective design of rational basis; structural design bed is not enough reasonable.
目前，国内对机械冲击式超细粉碎机的设计缺乏一定的理论依据。
At present, the design for Super Micro Mill at home lacks certain theoretical basis.
然而对上述现象和算法至今还缺乏满意的理论依据。
But these phenomena and algorithms still a lack of satisfactory theoretical basis.
对新兴国家来说，尽管当前“两极论”相当流行，但仍被认为缺乏足够的理论依据。
For a emerging-market country, there still lack of enough theory accordance to prove the "corner solution" though it is very fashionable now.
另外由于传播理论中性别研究的缺乏和女性主义研究的缺陷与纷争，造成女性新闻从业者寻求理论依据的困境。
Moreover, because of the lack of the research on gender and feminism, this leads to the difficult position of them to seek the basis of the theory.
另一方面为初中生安全感的培养提供理论依据，为家庭和学校心理健康教育提供基础，为安全感缺乏的干预提供一个基础。
On the other hand, it was to provide some theoretical bases for fostering security, for education about mental health from family and school, for intervention to the lack of security.
摘要：框架合同在建筑业得到越来越多的应用，但现有法规缺少对框架合同性质和功能的定义，缺乏相应的理论依据。
Abstract: framework contract has been widespread applied in the economic transaction, but there is no definition of character and function of framework contract, and less of theoretical basis.
在解决情感性社会技能缺乏问题上，传统的情感训练模式在理论依据与训练效果上受到许多质疑。
In solving the problem of children's emotional social skill shortage, people question datum and training effects of the traditional emotional social skill training model.
对现存分配关系成立的理论依据，人们众说纷纭，缺乏一个科学统一的认识，因此，需要我们对经典作家的分配决定理论进行重新考察。
Opinions Vary about the theoretical basis for the tenability of the existing distribution relationship and there is no unified and scientific understanding of it.
如何有效地对相应的风险进行评估以确定各个风险事件的优先级方面尚缺乏有效的理论依据。
But how to assess the corresponding risks effectively and how to identify priority of all risks lacks of effective theory.
关于语言与思维和文化关系的研究主要是建立在推理的基础上，缺乏观察和实验研究，目前看到的理论依据大多是主观的猜想和逸闻。
The research of the relationship between the language, thought and the culture is mainly based on the reasoning. But it lacks of observation and experimental research.
关于语言与思维和文化关系的研究主要是建立在推理的基础上，缺乏观察和实验研究，目前看到的理论依据大多是主观的猜想和逸闻。
The research of the relationship between the language, thought and the culture is mainly based on the reasoning. But it lacks of observation and experimental research.
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