更为复杂的是，深受一种文化推崇的特质不是一定不变的。
Complicating things further, the traits a culture values most are not fixed.
物理学一条基本定律认为动量守恒，也就是说，除非外力进入系统，否则总动量一定保持不变。
A fundamental law of physics holds that momentum is always conserved, meaning that unless some outside force enters a system, its total momentum must stay constant.
海洋的状态总是在变化，其潮汐遵循着一定的节律，但其本质不变。
数字式，指一种信号。该信号在一定的时间内，振幅保持不变。通常由一系列的高低脉冲表示。
Digital, Digital refers to a signal whose amplitude remains constant for a finite period of time. Digital signals are commonly represented as a series of high and low pulses.
有一个始于古希腊的传统观点认为稍纵即逝的流星和彗星并非属于不变的星空，它们一定仅仅属于某种大气变化。
This is a legacy from the Ancient Greek belief that meteors and comets were so fleeting that they could not belong to the unchanging heavens and must be atmospheric.
如果你的生活是稳定的、一成不变的、不断重复的，那么你需要间歇性地打破它，让自己得到一定的放松和自由。
If your life has a very stable, repetitive quality and routine, you need periodic breaks from this to loosen up and let yourself be spontaneous and free.
为达到销售收益增加的目的，在其他条件不变的情况下，价格调节本身必须在一定的范围内进行。
For increasing the sales income, the price adjustment itself must be proceed in certain dimension in terms of other conditions unchanged.
所以它不一定得是一个实际的数额，而可以只是一个根据他们的奉献程度且不是固定不变的数额的承诺。
So it doesn't have to be an actual amount, it's just a commitment according to their ability to commit and not a set amount.
在一定条件下它是可控的。受控成模后在线性介质中传播保持其模不变。
It could be controlled under some conditions. Controlled beam becomes mode which is unchanged propagation in linear media.
当磁感应强度增加到一定值时，其误差几乎不变。
While the relative error hardly changes if magnetic induction strength increases to some value.
这似乎不需要太多的手段：只要卖同样多的数量，把价格翻倍就行了，假设利润率不变，盈利一定翻倍。
This would seem to be no great trick: just sell the same number of units at double earlier prices and, assuming profit margins remain unchanged, profits also must double.
在一定的转速范围内，气相流速不变时，吸收系数随转子转速的增加而增加。
At a constant gas flow rate, the overall volumetric mass transfer coefficients increase with the rotational speed.
当光源的切向速度和视向速度都不为0时，在一定条件下光波波长不变。
When the tangential and radial velocity of light source both does not equal 0, the light-wavelength is changeless under certain condition.
物理定律，在不变压力下，一定质量的气体的体积与绝对温度的变化成正比。
The physical law that the volume of a fixed mass of gas held at a constant pressure varies directly with the absolute temperature.
从公式中可以看出，对于一定的霍尔器件，只要通过的电流i恒定不变，便可以通过霍尔器件的测量而间接测定磁场B0。
It can be seen from the formula: for a certain Hall device, the magnetic field B0 can be indirectly measured through measuring the Hall device if only the passing current I is constant.
在这个飞速发展的时代，网络外部性的存在在一定程度上改变了亘古不变的经济法则。
Its existence has changed the eternally invariable economic laws to some extent in the rapidly developing times.
但厚度增加到一定值时，磨损速率不变。
When thickness increases above a certain value, wear rate becomes unchanged.
孔压呈振荡变化并且最终趋向于某一定值后基本保持不变。
当接触面被完全剪断后，模型中的剪切应力出现了一定程度的下降，此后的剪应力在摩擦力的作用下基本保持不变。
However, as the interface was fully damaged, shear stress would decrease to a certain degree, and the residual shear stress nearly kept a constant value which equal to the friction force.
利用不变形式的方法对复流形上的CR—子流形进行了一定的研究。
In this paper we study CR - submanifolds of a complex manifold using the method of the invariant form.
材料试验机研究的结果表明，在一定的淀粉乳浓度范围内，凝胶强度和弹性模量随淀粉乳浓度的增加而增加，而凝胶弹性则基本保持不变。
The test result showed that the gel strength and the elastic modulus was increased while the gel elasticity was almost not changed with the increasing of the starch concentration.
用功率谱的方法对任意景物在空间频域进行分析表明，功率谱对于自然景物具有一定的不变性。
Different scenes are analyzed in the power spectrum spatial frequency domain, it can be shown that the power spectrum of most natural scenes is of invariability.
结果表明：在一定范围内，其它工艺参数不变，增加功率，增大扫描速度，晶粒更趋致密细小；
The results show that a certain extent, the other parameters constant, increasing power, increasing scanning speed, small grains become more dense;
这样，即保证了原始解释变量的信息基本不变，又使原来较复杂的回归分析过程，得到了一定的简化。
Thus, it namely has guaranteed basic invariable of the primitive explanatory variable information, also causes originally the complex regression analysis process, obtaining certain simplification.
当磁感应强度增加到一定值时，其误差几乎不变。为减少误差，应选用电子数较少的分子材料作母液。
While the relative error hardly changes if magnetic induction strength increases to some value. In order to decrease error, molecule with less electrons...
当流量在一定范围内变化时，主流区下方均有漩涡低速区或死水区，该区域的大小与流量有关，其位置基本不变。
There is a whirlpool or dead zone below the main water flow zone when the flow changes and the size of which is related to flow but its location basically unchanged.
当入射角在一定范围内变化时，两束分开的光束的传播方向保持不变。
The propagating directions of the two splitting beams remain unchanged when the incident Angle varies in a certain range.
此外，该算法在确保一定的嵌入容量的情况下，能够使视频流长度在信息嵌入前后保持近似不变。
Furthermore, the algorithm has a considerable embedding capacity, and can keep the nearly invariant size of video stream.
此外，该算法在确保一定的嵌入容量的情况下，能够使视频流长度在信息嵌入前后保持近似不变。
Furthermore, the algorithm has a considerable embedding capacity, and can keep the nearly invariant size of video stream.
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