商业决策通常是由许多未知和不可知的因素做出来的，这些因素甚至会让最优秀的扑克玩家感到困惑。
Business decisions are often made with many unknow and unknowable factors, which would even puzzle the best poker players.
两种不同的结果是否由环境或基因因素引起尚未可知，不过中国既为研究提供了丰富的课题，也为得出的治疗方案备好了行销有路的市场。
Whether the different outcome is the result of environmental or genetic factors is unknown, but China offers a huge pool of subjects for study and a promising market for any resulting treatments.
例题分析：由原文可知，女人抱怨想买衣服但是没有钱了，男人说她没有budgeted your money better，乍一看A、D都像是正确的，但A项的a very tightbudget是由D项的notcarefulenoughinplanning herspending导致的，所以D项才是最佳选项！
He's willing to lend the woman money for the fur coat. D) The woman is not careful enough in planning her spending.
由定义可知，它们非常难以预测。
犬儒学派者和不可知论者会说这是由一个死亡的大脑产生的现象。
Cynics out there would say and agnostics would say that's phenomenon that comes from a dying brain.
由这个结果可知，当磁盘的负载较小时，缓冲池的效率就越高。
This result leads us to believe that the buffer pool was more effective when the disks were less taxed.
最后，服务只是由对TCS的确定接口可知的，在服务处理的内部没有详细信息。
Finally, services are only known by a defined interface to the TCS; there are no details on the internals of the service's processing.
由上图可知，曲线型女性在29岁时自信心强于骨瘦如柴型的，而且一直保持领先。
Curvy women pass skinny ones in self-confidence at age 29 and never look back.
您已经知道，在浏览器中看到的一切，是由15行代码驱动的，可知Grails的威力有多大。
Knowing that everything you see in the browser is being driven by 15 lines of code gives you an idea of the power of Grails.
故可知人生是由“渐”维持的。
Hence it is evident that life is sustained by "gradualness".
由上次的测试可知，如果一个东西是保守的，要确定是不是梯度，我们只需要计算旋度，查看它是否是。
The test that we saw last time saying, well, to check if something is a gradient field if it's conservative, 0 we just have to compute the curl and check whether it's zero.
由质心的定义可知，它就是x的平均值。
If I look at the definition of the center of mass, it's the average value of x.
由上面两图可知：身份验证是通过交换GSS - API令牌来实现，这对于GSS - API安全模型非常典型。
As you can see in the above figures, the authentication is achieved by exchange of GSS-API tokens, which is very typical with the GSS-API security model. The key points to notice here are.
由截线及杠杆定律分析可知，低碳铁素体成核并长大，剩下含碳量高的奥氏体。
Tie-line and level-law calculations show that low-carbon ferrite nucleates and grows, leaving the remaining austenite richer in carbon.
由搭接节点耗能分析可知，总体看来各试件具有良好的耗能能力。
It was finally known from energy consumption analysis of joints that, generally speaking, all specimens possessed good capability of energy consumption.
由声学的基本原理可知：产生噪声的根本原因是振动。
Due to the basic theory of acoustics:the fundamentality reason of noise is vibrate.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而绝不是完全正确的。
It follows from the principle of relativity that Newton's second law of motion, although fundamental in classical mechanics, only has an approximate and by no means complete validity.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而决不是完全正确的。
It follows from the principle of relativity that Newton's second law of motion although fundamental in classical mechanics only has an approximate and by no means complete validity.
由结果可知，该机的实际起飞重量与优化结果十分相似，证明了优化计算的可行性和高精度。
Simulation result shows that the result of the optimization is resemble to the practice, and the algorithm is feasible, reasonable and of high precision.
由加工工艺原则可知，保证平面的加工精度要比保证孔的加工精度容易。
By the principle known Processing, the plane guarantee precision machining holes than guarantee the machining precision easy.
由这一事实而参之以上古文献，可知，在中国先民的心中，有统一的龙的理念，却并没有统一的龙的图像。
Based on this understanding and consultations of ancient classics, we can draw the conclusion that there did not exist an unitary image hut an unitary idea of dragon for the ancient Chinese people.
由该式可知，就光强输出而言，前屏具有一个最佳厚度，在此厚度下光强输出最大。
If can be seen from this formula that there is an optimized thickness for front screen, at this thickness the light output is largest.
由破产模型与排队模型之间的联系可知，本文的结果在管理科学中有许多应用。
By the relationship between ruin model and queueing model we know that the results we obtain can be applied to management science in many aspects.
由切应力互等定理可知，在截面边缘上各点处切应力方向必与圆周相切。
Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.
由红外光谱可知，聚-2 -氨基吡啶具有头-尾相接的结构。
The IR spectra indicate that poly 2 aminopyridine has head to tail structure.
由压缩机的结构和工作原理可知，压缩机的振动信号基本上都是非平稳信号，如气阀，十字头、活塞等振动信号。
The vibration signals of reciprocating compressor are basically non-balanced from its configuration and work principle, such as the vibration signals of air-valve, crosshead and piston.
由实验结果可知钎料凸台可以提供足够的剪切强度。
It is shown that the bumps can supply sufficient shear strength for use.
由实验结果可知钎料凸台可以提供足够的剪切强度。
It is shown that the bumps can supply sufficient shear strength for use.
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