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This is a kind of evolutionary elliptic free boundary problems, in which the free boundary changes with time and at each fixed time the unknown function satisfies a boundary value problem for an equation of elliptic type.

详细本文分两部分。第一部分讨论拟定常电加工问题。这是一类发展型的椭圆自由边界问题，其自由边界依赖于时间的变化而不断演化，在每一固定时间，未知函数满足椭圆型方程的边值问题。

We all know how frustrating it is for ELS when reading English newspaper or magazines with full of unknown vocabularies.

我们都知道当你在看英文报纸或者杂志的时候，都是一些不理解的单词，是多么泄气的事情。

Today, Elton is a prominent rock star, but only a few years ago he was unknown.

现在，爱尔顿是一位著名的摇滚歌星，可是数年前，他却默默无闻。

The electronic beat echoes that of our mother's heart we heard as a fetus, calming us, emboldening us, giving us the courage to venture forth into an unknown reality.

电子的嗡嗡回响声隐喻母亲的心脏跳动，就像我们还是胎儿时听到的，镇定我们，鼓励我们，给予我们勇气冒险、探索未知的世界。

The first pathogenetic gene identified is α-synuclein, but its phathological mechanism is unknown. In previous study, it's demonstrated that all synuclein isoforms expressed massively in early embryologic development of the central nervous system.

先前有研究指出所有的synuclein异构型在胚胎发育早期即在中枢神经系统被大量表现，显示这一类基因对中枢神经系统的发育可能是很重要的，但是研究synuclein在胚胎早期发育方面的相关研究则较少。

Even when a mere child I began my travels, and made many tours of discovery into foreign parts and unknown regions of my native city, to the frequent alarm of my parents, and the emolument of the town-crier.

即使仅仅是孩子，我开始我的旅行，并提出了许多旅行到国外发现部分和未知的区域我的城市，经常报警的我的父母，和薪酬镇，喊叫。

Every three month for 20 years this little hand of healers met at the Walton Hotel behind locked doors and engaged in unknown emprise lasting till dawn.

二十年来，这一小撮医生，每隔三个月，就聚在华尔饭店开一次会，直到黎明，不知其做些什么。

However, the role of miRNAs in peritoneal EMT and fibrosis during PD are largely unknown.

但miRNA在腹膜间皮细胞上的表达以及在腹膜EMT和纤维化中的作用国内外尚未见报道。

He tells the unknown person on the other end of the line,"They are leaving now."

他向电话另一端不知名的人说，"他们现在正离开。"

Some investigations suggested that cyclins and CDK played an important role in the regulation of endomitosis of megakaryocyte. However, the mechanism of cyclins and CDK in the regulation of endomitosis of fetal megakaryocytes during ontogenesis and the relationship between cyclins/CDK and retardation of endomitosis of fetal mgakaryocyte is totally unknown.

一些研究发现周期蛋白和CDK在巨核细胞核内有丝分裂的调控上起重要作用，然而，周期蛋白和 CDK在胎儿巨核细胞核内有丝分裂调控上所起的作用，及其与胎儿巨核细胞核内复制延迟的关系目前全然不知。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"