查询词典 impossible event

" The young acolyte said,"But it is impossible to make a mirror out of a brick, Father Prior.

"住持回答说"我想把这块砖磨成镜子"小和尚又说"但是砖是无论如何也磨不成镜子的。

It's impossible to get across town these days.

目前想要进城是不可能的。

I've had it with all this traffic. It's impossible to get across town these days.

我撞上了所有的红灯，这几天不可能穿过这个小镇。

The actual life in the human society indicates that this is impossible!

人类社会的现实生活表明这是不可能的！

Kennedy ever after concealed the truth about his Addison's disease; if voters had known that Kennedy suffered from a debilitating illness, his future political career, and his election as President, would have been impossible.

如果选民知道肯尼迪患有一种使其体质虚弱的疾病，他未来的政治生涯，他当选总统，就都是不可能的了。

In some cases, it may be impossible for to make the adjustment.

" "在某些情况下，这也许是不可能的，使调整。

It was an impossible beginning, Adm.

它是一不可能的开始，Adm。

But it is often impossible to obtain enough admissible evidence to obtain a conviction, the government argues.

但是政府抱怨说要得到足够的证据进行指控通常是不可能的。

Admittedly, it was difficult, but it wasn't impossible.

无可否认地它是很难，但并非不可能。

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

It was just a normal day of school

那只是上学的普通一天

Which is a very good reference in this issue.

这是一个在这个问题上很好的参考。