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IT development in the early days, is not popular because of the network, file sharing is more floppy disks, most users do not know to be safe to open the floppy disk of unknown origin.

在IT发展早期，由于网络还不流行，文件交流更多的是通过软盘，因此大部分用户都得知要安全就不要打开来历不明的软盘。

Calculate way 1: Inside it the parameters number have already known, the unknown X of the square equations , can pass to push the estimate of with following calculate way: Among them α=0.95 ～ 0.99 for forgetting the factor, mean the oushifan number, block diag to mean to divide an opposite angles matrix .

算法1：当中参数已知时，方程的未知数X，可用如下算法递推估计：其中α=0.95～0.99为遗忘因子，表示欧氏范数，block diag 表示分块对角阵。

In this paper, a research of the problem of optimal control for unknown nonlinearsystems is made.

本文针对未知非线性系统，就其最优控制问题的解决方案进行了相关研究。

In medical researches, the optimality of observed data about the postulated model was unknown in many cases.

研究中获得的数据关于某种假定模型的典型性是未知的，常常是非典型的。

It used to solve a large number of unknown things with the optimization problem.

它用于解决带有大量未知事物的优化问题。

Orcus'' background and origins are unknown.

奥库斯的背景与原形全都不明。

Mere amateurs in 2009 will make ornithological history in China by discovering birds unknown to science.

在即将来临的2009年里，中国鸟类学史大概会由不打眼的业余人士通过发现未知的鸟类而刷新。

To achieve better results,we make use of the discrete Radon transform and a set of discrete orthogonal Tchebichef polynomials to establish relationship between the projection moments and the image moments,and then estimate the unknown projections from the known projections using this relationship.

提出一种新的投影数据估计算法，利用离散Radon变换和Tchebichef正交多项式建立图像矩和投影矩之间的关系，并用这种关系从已知投影数据中估计未知投影数据，达到提高重建图像质量的目的。

The symmetric property and compact support are incompatible for orthogonal wavelets in function space, whether the properties of discrete orthogonal wavelets can be compatible is still unknown.

函数空间中正交小波的对称性和紧支性不能兼容，而离散空间中正交小波的性质能否兼容仍然是一个未知的问题。

The phylogenetic relationships among all taxa within the Acrididae (Orthoptera: Acridoidea) were largely unknown until now.

迄今，蝗科内各分类阶元之间的系统发生关系大部分是未知的。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷