It's difficult to estimate the number of youngsters involved in home schooling where children are not sent to school and receive their formal education from one or both parents.
很难估计有多少年轻人接受家庭教育，在家庭教育中孩子没有被送去学校，而是从父母一方或双方那里接受他们的正式教育。
There are a few cases in which it is notthat difficult to estimate asset values.
有些情况下，评估资产价值是很容易的。
Is also difficult to estimate the extent the scope of the problem, the number of users at risk.
目前也难估计，该问题的范围有多大，多少用户还处于危险中。
If you are unfamiliar with its internal design, the cost of updates can be difficult to estimate.
如果您对现有产品的内部设计并不熟悉，可能很难估计更新成本。
For the same reason, proliferation is very difficult to estimate once some cells have started to fuse.
出于同样的原因，扩散是很难估计一旦一些细胞开始融合。
It's difficult to estimate the borderline of these three qualities because they are blent together as one.
因为它们是混为一体的，所以我们很难准确区别三者之间界限。
She added that it's difficult to estimate Numbers of this unintended catch, or even how it impacts ocean health.
她还表示，要估量这些混获品的数量乃至混获对海洋环境的影响是件非常困难的事。
Among the three parameters, it is difficult to estimate K because of its difficulty to be measured directly.
三个参数中，以预测非饱和导水率最为困难，原因之一在于直接测定困难。
While the information is quite difficult to estimate since it is very subtle and the pulse duration is very short.
但由于这一信息非常微弱，且脉冲信号的持续时间很短，多普勒变化率的精确测量也十分困难。
However, they are notoriously difficult to estimate and quantify, almost all of them carry large estimation errors.
但是，它们却难以估计和量化，一般都带有误差项。
However, if the tracking window is too small, it can become difficult to estimate motion from one frame to the next.
然而，如果跟踪窗口太小，它可以变得很难估计的运动，从这一帧画面到下一个。
Unfortunately, it is difficult to estimate the amount of concurrency supported by a single dispatcher thread on this kind of system.
遗憾的是，难以评估这种系统中单个调度程序线程支持的并发数。
It is very complicated and difficult to estimate initial and promise costs in foreign loans. Usually, this is done by computer abroad.
国外贷款中的前端费和承诺费计算很复杂，手算十分困难，在国外均采用电子计算机计算。
During the new type ammunition and rocket system development, fewer sample data make it very difficult to estimate the development cost.
在新型弹箭系统的研制中，由于样本数据较少，给研制费用估计带来一定的困难。
These first-ever projects have many similarities with pure research projects, where it is very difficult to estimate and predict the outcome.
那些第一次的项目同纯粹的研究项目之间具有很多相似之处，它们非常难以评估和预测结果。
It is more difficult to estimate and separate LFM as a result of the appearance of multi-object and the applying of Multi-LFM radar wave signal.
从回波信号中进行多目标信号分离和提取始终是防撞雷达的一个关键技术难点。
The costs of any such meltdowns are difficult to estimate, but when all is said and done the latest one is bound to be judged one of the more expensive.
虽然那些危机的代价难以估计，总而言之最近的这一次银行业危机注定被是代价更昂贵的一次。
The first fall two powder, the third fall half: first day such as rain, the second is cleared, the third if rain will fall fifteen. Difficult to estimate.
初一落初二散，初三落月半：初一如下雨，初二则会放晴，初三若下雨则会落到十五。难估计。
Such food, moreover, taxes our digestive organs decidedly less, and, in making us more contented and sociable, produces an amount of good difficult to estimate.
而且这样的食品能明显降低对我们消化器官的负担，又能使我们更容易满足、更善于交际，带来不胜枚举的益处。
The global incidence of foodborne disease is difficult to estimate, but it has been reported that in 2005 alone 1.8 million people died from diarrhoeal diseases.
全球食源性疾病发病率难以估计，但据报道，在2005年就有180万人死于腹泻病。
It has been difficult to estimate the possible wave heights of any tsunami - the waves may not arrive at all or could be as high as 10 metres above normal sea level.
海啸可能达到的波高向来很难估计-海浪可能根本无法到达，或者可高达超出海平面10米。
Though it may be possible to measure the value of material goods in terms of money, it is difficult to estimate the true value of the services which people perform for us.
虽然物质产品的价值可以用金钱来衡量，但要估算别人为我们所提供的服务的价值却是极其困难的。
Though it may be possible tomeasure the value of material goods in terms of money,it is extremely difficult to estimate the true value of the services whichpeople perform for us.
虽然物质产品的价值可以用金钱来衡量，但要估算别人为我们为所提供的服务的价值却是极其困难的。
As Posner emphasizes, it is very difficult to estimate with any precision what is the actual probability of highly infrequent events, and such a leak would fall within this class.
正如波斯纳强调的，要精确估计高度偶发事件的实际发生概率是非常困难的，这次的漏油事件就是属于这类事件。
Though it may be possible to measure the value of material good in terms of money, it is extremely difficult to estimate the true value of the services which people perform for us.
虽然物质产品的价值可以用金钱来衡量，但要估算别人为我们为所提供的服务的价值却是极其困难的。
Though it may be possible to measure the value of material goods in terms of money, it is extremely difficult to estimate the true value of the service which people perform for us.
虽然物质产品的价值可以用金钱来衡量，但要估算别人为我们所提供的服务的价值却是极其困难的。
Though it may be possible to measure the value of material goods in terms of money, it is extremely difficult to estimate the true value of the services which people perform for us.
虽然用钱来计算这些物质货物的价值是可行的，但是估计这些其他人为我们提供的服务价值会是非常难的。
Though it may be possible to measure the value of material goods in terms of money, it is extremely difficult to estimate the true value of the services which people perform for us.
虽然用钱来计算这些物质货物的价值是可行的，但是估计这些其他人为我们提供的服务价值会是非常难的。
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