最后一个选项不是必须的，特别是因为它的值很难测量，但希望限制打印图形密集型文件的用户的确可以利用这个选项。
The latter is not required, especially because it's a difficult value to gauge, but it does provide options for people who want to limit the printing of graphically intensive files.
在基于专家经验的方法中，精度来源于评估人员的知识和经验，很难测量和验证。
In expertise-based methods accuracy is a product of the estimator's expertise and experience, which cannot be easily measured and validated.
大气中三氟化氮的浓度大约为0.5万亿分之一(ppt)，使得它很难测定。
The concentration of nitrogen trifluoride in the atmosphere is about 0.5 part per trillion, making it very hard to measure.
他们说，让人们关心数十年以后的气候威胁实在是太困难了，更何况自然气候循环本身也是变幻难测。
Getting people to care about a climate threat that is decades away is hard enough, they say, without adding in the vagaries of natural climate cycles.
平面、外圆、内孔、凹槽及其他较难测量的表面。
Plane, outer circle, inner hole, groove and other surfaces that are difficult to measure.
性别和年龄与其它的环境和个人变量普遍联系，以致很难测定变动的真正来源。
Gender and age are generally linked with other situational and personal variables, making it difficult to determine specific sources of variation.
小型制冷系统制冷剂循环量是一个重要而难测定的参数。
The measurement of refrigerant mass flow of small refrigeration system is very important parameter and difficult to measure.
这对于那些依赖于流量读数的控制尤其是如此，这些流量读数在低流量速率下是很难测量的。
This is particularly true of controls relying on flow readings that are difficult to measure at low flow rates4.
Oken博士说，新的研究显示18个月的婴儿没有表现出DHA的助益作用可能是因为婴儿期的效果“很难测量”，或“可能是DHA的助益作用没有4岁时那样明显”。
Oken said the new study might have shown no benefit in 18-month-olds because effects in infants might be "hard to measure" or "it may be that the benefit of DHA is not as important as when you're 4.
当然舒适度是个很难测定的指标——每个选手对感觉得舒服这个定义的理解各不相同。
Comfort is difficult to measure - each player has a different perception of what feels comfortable.
尽管往后变化难测，愈远看愈渺茫，然而大体的计算是可能的，估计前途的远景是必要的。
Even though future changes are difficult to foresee and the farther ahead one looks the more blurred things seem, a general calculation is possible and an appraisal of distant prospects is necessary.
提出了一种利用神经网络对2个难测量的参数进行在线辨识的方法，从而控制烧结混合料的加水量。
This paper presents a method employing neural network to identify water content and evaporating coefficient, difficult for in process measurement, controlling water added in sinter mixture.
可测试性与可行性直接相关，并且很可能找到很难测试的高层次需求。
Testability relates directly to feasibility, and it may be possible to find high-level requirements that might be quite difficult to test.
在试验结果的获取中，为能够得到很难测量的线电极周围的放电间隙和工件形状数据，提出一种新的三维形状测量方法。
In order to obtain the 3D data of the discharge gap and workpiece shape from the experimental results, a new measurement is proposed.
罗十一33深哉，神的丰富、智慧和知识！他的判断何其难测，他的道路何其难寻！
Rom. 11:33 O the depth of the riches and wisdom and knowledge of God! How unsearchable are His judgments and untraceable His ways!
在农田水分平衡中，较难测定的要素有农田蒸腾蒸发量、地下水毛细上升量和土壤水渗漏量。
Of all components of water balance in farmlands, evapotranspiration, capillary rise from a water table and deep percolation are difficult to determine.
尽管电脑犯罪的范围很难测定，但是大多数专家认为它是非法活动增加最快的领域之一。
Although the actual extent of computer crime is difficult to measure, most experts agree that it is one of the fastest growing areas of illegal activity.
交调失真的不对称性描述了功率放大器的记忆特性，但是与幅度相比，交调分量的相位特性很难测量。
Asymmetries of intermodulation distortions describe the memory effect of power amplifiers (PAs), but it is hard to measure asymmetries of the phase of the IM components.
交调失真的不对称性描述了功率放大器的记忆特性，但是与幅度相比，交调分量的相位特性很难测量。
Asymmetries of intermodulation distortions describe the memory effect of power amplifiers (PAs), but it is hard to measure asymmetries of the phase of the IM components.
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