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The mechanics model of a ball screw was developed considering the factor of lead angle,and the main curvature of the helical surface was deduced using differential geometry method,and the effect of lead angle on the elastic deformation was analyzed.

考虑螺旋升角的因素，建立了滚珠丝杠副的受力模型，应用微分几何理论推导了螺旋面的主曲率，并进一步分析了螺旋升角对滚珠丝杠副弹性变形的影响。

In order to research the flow mechanics inside tube inserted with twisted-leafs discontinuously,a mathematical model for turbulent flow resistance was developed,and the influence of the twist angle α and the swirl angle β on the form drag was analyzed by numerical simulation.

为了研究管内间隔插入旋流片的流动机理，建立了流阻数学模型，通过数值模拟分析了旋流片的旋转角α和旋流角β对j(形体阻力与摩擦阻力的比值)的影响。

It is in the integration of traditional vision angle and the modern one, that Liming has developed its own artistic style and outlook.

正是在这传统与现代的视界交融中，刘鸣形成了自己的艺术面貌和风格。

Meanwhile, the concentration of Pb,Zn and other heavy metals is rather high in the oxidation zone and decreasesdownward to levels that are unbelievably low for Pb-Zn mine tailings. Theseobservations suggest that heavy metals should be re-immobilized by secondaryminerals, rather than primary minerals, in the oxidation zone, and could be leachedout from suboxic environment due to low rate oxidative dissolution which preventsthe precipitation of secondary minerals in significant amount. Thus, cover scenarioswhich establish a suboxic environment beneath the cover layer might not always beeffective in preventing heavy metal release from mine tailings.Sequential extraction studies indicate that, in addition to heavy metal leaching,oxidation of the mine tailings increased the mobility of residual Zn, and Cu, while Pb remains immobile due to the formation of anglesite (PbSO4). Using the seven-step extraction technique developed by Dold (J. Geochem. Explor., 2003, 80: 55-68), galena dissolves in significant amount at step 2 most probably due to the strong complexing of Pb2+ by acetate, while other metal sulfides dissolve at step 6, which suggest that this extraction technique could not be used to evaluate the mobility of lead in natural environment

重金属含量均低于新鲜尾矿，但以硬化层中的含量最高(Pb、Zn含量分别为0.47%和0.93%)，往下大幅度降低，表明尾矿风化过程中形成的次生矿物对Pb、Zn等重金属元素有较强的固定作用，而次氧化带的淋溶作用造成了金属元素的大量流失；(4)与新鲜尾矿相比，硬化层中铅的可迁移性大大降低，硬化层之下尾矿样品中铅的可迁移性也不同程度降低，这是由于硫化物氧化产生的硫酸根与尾矿中的铅反应形成铅矾(PbSO_4)的缘故；(5)氧化作用使尾矿中的zn、Cu等重金属的可迁移性不同程度地增大，其中对锌的可迁移性影响最大，铜的可迁移性与铁比较相似，铅则容易与硫化物氧化形成的SO_4~(2-)反应形成铅矾(PbSO_4)；(6)为了减少尾矿污染和修复矿山环境，人们提出了各种不同的尾矿覆盖方案，本文的研究结果表明，这些方法不一定能够有效地阻滞污染元素的迁移。

Years of angling, most of us have developed a collection of great fish recipes.

年的钓鱼，我们大多已制定了一个收集的伟大鱼类食谱。

By that time Latin, Old Norse (the language of the Viking invaders), and especially the Anglo-Norman French of the dominant class after the Norman Conquest in 1066 had begun to have a substantial impact on the vocabulary, and the well-developed inflectional system that typifies the grammar of Old English had begun to break down.

藉着那次拉丁文，旧的 Norse人，而且尤其在诺曼的战胜后的占优势的班级诺尔曼系英国人法国人在 1066 年已经开始带给字汇一种实质上的冲击，而且发展良好的代表老英国人的文法屈曲的系统已经开始压倒。

First, a program which can be used to obtain the encoder values of each joint D. C. servomotor and then change them into angular position is developed. By means of cubic spline, the angular velocity and angular acceleration are calculated.

本文开发了实时采集和转换机器人各关节的码盘值为角位移的程序，并提出了以三次样条函数求各关节角速度和角加速度的方法，提高了计算精度。

Framing shadowgraphy of UV laser probing with the 4th harmonic Nd-YAG Laser was developed for the diagnosis of Z-pinch plasmas. This system can effectively shield visible light and has advantages of high temporal resolution,large optical angular aperture and wide measuring range.

采用Nd-YAG激光器的四倍频激光(266nm)设计了激光探针分幅阴影成像系统，该系统具有时间分辨率和收光效率高，测量范围大，可有效屏蔽可见光干扰的优点，在钨丝阵实验中成功获得晚期内爆等离子体的分布图像。

In recent two or more decades, stereodynamics,focused on the research of correlation of angular momentum and othervectors in the process of reactions, was developed and has made a greatachievement both in theories and experimental methods.

近二十几年来发展起来的立体化学动力学以研究反应过程中矢量相关为主，对反应过程中的角动量的研究在理论和实验上都取得了很大的进展。

In recent years, stereodynamics, focused on the research of correlation of angular momentum and other vectors in the process of reaction, was developed and has made a great achievement in both theories and experimental methods.

只有把标量和矢量性质结合起来才能给出一个完整的反应动力学图像。

You need to lie low for a while.

你们得歇手一段时间

If you do, you may just be pleasantly surprised.

如果你开口问了，或许有意想不到的惊喜。