无法估计的

The key points of sensorless technology in PMBLDCM are to study a method which can detect rotor position accurately by simply method in whole speed range. After analyzing current sensorless methods of the PMBLDCM, it is found that those methods are successful at middle and high speed, but they often fail to detect rotor position at low speed when the back electromotive force is small or zero.

纵观目前的永磁无刷直流电机的无位置传感器控制方法，比较成熟而可行的方法多集中于电机在中高速区域运行时，能够较准确估计转子位置；电机处于低速、极低速、静止状态时电加热管，因为反电动势幅值较小或者为零，而无法正常工作。

In the end, you can't make others the gauge by which you measure yourself.

最后，通过你自己的估计，你无法达到别人的要求。

The limitation of the existing two methods for network security management systems is showed as the following: the cut-set method cannot analyze large network, and the Monte-Carlo method gives only the interzone evaluation, but not accurate results.

现存的两种评估网络安全管理系统的生存性的方法存在较大局限性：割点法无法对大型网络进行分析；Monte-Carlo法只能区间估计，得不到准确值。

To make this conclusion more convincingly, the author should provide more information about Palea and Lithos, including the time they lived, the tools they use and other relevant background.

最后一层让步，估计绝大多数人都会忽略掉：即便证明了 P 人无法过河，完全有可能是 L 的人使用船只过河带走了 P 的篮子。

Heating billet temperature cannot be detected in the hearth. Only by detecting temperatures of the stove side or hearth with estimation from mere experience could lead to great error on the measurement of billet temperature and affect the quality of post-processing accordingly; Overheating also exists in the heating process, and the quality of product is sway by overheating oxidation. Though infrared thermoscope is used to detect the temperature of billet when it is taken out of the stove, precision is still affected because of the oxide layer on the surface.

燃气与空气的配气量比例，一般通过人工调节，未实现按加热条件自动动态调节；无法在炉膛内检测被加热钢材的温度，只能通过检测炉壁或炉膛温度，再凭经验估计钢材温度，结果是钢板温度误差大，影响后续加工质量；钢材加热存在表面过烧现象，有时表面烧损、氧化严重，影响产品质量；尽管钢材出炉时，可用红外线测温仪来进行钢材表面温度检测，但因钢材表面存在氧化层，也影响钢材温度检测精度。

They estimate that nearly 33 percent of these were previously unidentified and are new to science.

他们估计其中接近33%的物种是目前无法鉴别的，即是科学上的全新物种。

Empiric recurrence risk estimates can be used in all families in which molecular genetic testing of RB1 and linkage analysis are unavailable or uninformative.

对于所有 RB1分子遗传学检测和连锁分析都无法进行或无有效信息的家族，都可以采用经验性的复发风险估计。

The extended Kalman filter is generally used to linearize the state or measure equations of the nonlinear system, and the linear method can be used.

因为系统偏差和雷达的量测之间是一种非线性关系，所以无法直接使用Kalman等线性滤波直接进行系统偏差的估计。

MUSIC is a classic spatial spectrum estimation algorithm that has a super high resolution and is widely used today, however, it cannot estimate successfully the azimuths and elevations of signals that are correlated.

其中，MUSIC 法是一种经典的空间谱估计主流算法，具有超强的分辨性能，但它无法实现对相干信号进行测向分辨。

Unfortunately, accurately quantifying below-ground C fluxes and estimating fine root longevity are still elusive. One of reasons is because we do not know the proportions of shortlived vs. long-lived root pools or the distribution of fine root longevity within these pools.

但是，准确量化地下C通量以及估计细根寿命仍然是目前研究中的难点，其原因之一是因为我们无法确定不同寿命细根间的数量比例关系，抑或说不清楚细根寿命符合何种统计分布。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。