In many practical problems of modern engineering , the real system involved mostly are unknown nonlinear dynamical systems , thus need the resolution of optimal control of the real unknown systems 在现代工程的很多实际问题中,所涉及到的实际系统大多是不可知的非线性动态系统,因此会经常面临未知系统的最优控制问题。
I wiped my tears and hushed my sobs , fearful lest any sign of violent grief might waken a preternatural voice to comfort me , or elicit from the gloom some haloed face , bending over me with strange pity 我抹去眼泪,忍住哭泣,担心嚎啕大哭会惊动什么不可知的声音来抚慰我,或者在昏暗中召来某些带光环的面孔,露出奇异怜悯的神色,俯身对着我。
Nana listened to these recitals and felt her terrors growing upon her . she had always trembled before the law , that unknown power , that form of revenge practiced by men able and willing to crush her in the certain absence of all defenders 娜娜听到“法律”两个字就打哆嗦,法律的威力是不可知的,男人们可以用法律来报复她,把她置于死地,而世界上却不会有一个人来为她辩护。
Without the teachers ' evaluation , students will lose the affirmation to the difference and the way of learning . as the learning subjects , students should never for a moment deviate from the teacher , especially in the classroom instruction 这一点十分重要,没有教师设计、组织,学生的语文学习将会陷入无序而不可知的状态,没有语文教师的评价,学生将会失去对差距的确定,迷失努力方向。
Facing an uncertain future , they fought with all their might to save their lives , but at the same time , they looked at the moon with deep regret , as they were filled with frustration by their unsuccessful attempt to explore the mysterious galaxy 三个太空人在茫茫的星河中,同心协力寻找回家的路。面对不可知的未来,在全力和生命搏斗的同时,眺望月球,仍有著功败垂成的遗憾,渴望了解神秘的银河。
The people were silent , and only pressed closer and closer on one another . to bear each others weight , to breathe in that tainted foulness , to be unable to stir , and to be expecting something vague , uncomprehended and awful , was becoming unbearable 这群人默不作声,只是挤得愈来愈紧,互相偎靠着,呼吸着这股被感染了的窒息的空气,没有力气移动身子,等待着某种不可知的不可理解的可怕事情发生,是教人难以忍受的。
One major religion features a god of power and revenge ; another worships one that is silent and indifferent to the suffering of people ; still another offers a god that is mysterious and unknowable , absorbing all of humanity into the great cosmic ocean of oneness 一种主要的宗教尊崇一个强有力、复仇之神;另一种则敬拜一位对于人民苦难沉默、无动于衷的神;还有人信仰一位神秘、不可知的神,这位神把所有的与人性相关的东西归纳为无所不包容的唯一。
Limited by time this paper focused on three areas : ( 1 ) basic dtc principal study and research ( 2 ) the design of speed regulator of dtc ( 3 ) a new kind of stator flux observer because the dtc system is a nonlinear system and we ca n ' t grasp the parameters completely , the classic speed regulators design method is not fit for dtc system 由于时间有限,本文所进行的研究工作主要集中在三个方面: ( 1 ) dtc基本原理的学习与实现( 2 ) dtc中转速调节器的设计研究。 ( 3 )新型定子磁链观测器的研究。 dtc所具有的非线性和参数不可知的特性决定了直流调速系统的转速调节器的设计方法不能完全适合于dtc系统。
Natasha and madame byelov always took the same seat before an image of the mother of god , carved at the back of the left choir ; and a new feeling of humility before the great mystery came over natasha , as at that unusual hour in the morning she gazed at the black outline of the mother of god , with the light of the candles burning in front of it , and the morning light falling on it from the window 教堂里的人总是很少娜塔莎和别洛娃在嵌在唱诗班左后方的圣母像前面停下来,站在她们常站的地方。每当在这不寻常的早晨凝视着被烛光和窗外射进的晨光照亮的圣母暗黑的脸庞,听着那她紧跟着念并努力理解的祷文。在这伟大的不可知的事物面前,娜塔莎总有一种未曾体验的谦卑的感觉。
Who would fardels bear , to grunt and sweat under a weary life , but that the dread of something after death , the undiscover ' d country from whose bourn no traveler returns , puzzles the will and makes us rather bear those ills we have than fly to others that we know not of 谁愿意负着这样的重担,在烦劳的生命的压迫下呻吟流汗,倘不是因为惧怕不可知的死后,惧怕那从来不曾有一个旅人回来过的神秘之国,是它迷惑了我们的意志,使我们宁愿忍受目前的磨折,不敢向我们所不知道的痛苦飞去?