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Meshing properties and application of major conical surface double envelope Hourglass worm gearing;2. In this paper, the regularities of undercutting and topping of major conical surface envelope hourglass worm is researched.

分析了大锥面包络环面蜗杆的齿顶变尖和根切规律，并通过和平面包络环面蜗杆的比较，得出其在根切和齿顶变尖这两个方面具有比平面包络蜗杆更优良的性能，因而是一种在实际中可替代平面包络、具有广泛应用前景的新型包络蜗杆传动。

Taking the minimization of the tooth crown of a worm wheel and the maximization of transmission efficiency and the distance from the center as objectives,we establish the mathematical model for the multi-objective optimal design of worm transmission on the condition that the worm wheel and the worm transmission meet the requirements for load,strength and others.

以蜗轮齿冠体积最小、传动效率最高和中心距最小为目标，在保证蜗轮和蜗杆满足承载、强度及其它要求的前提下建立蜗杆传动多目标优化设计的数学模型。

To objectively evaluate the surgical trauma to the basilar membrane of the cochlea after cochlear implant electrode insertion through analyzing the thresholds of cochlear microphonic of round window electrocochleography recording pre and post cochlear implant operation.

分析人工耳蜗电极植入前后圆窗耳蜗电图中耳蜗微音电位阈值的变化，以客观评估人工耳蜗植入手术是否对耳蜗基底膜造成损伤。

Involute cylindrical worm-helical gear transmission is to use helical gears to replace worm wheels in traditional worm wheel transmission so as to form a new worm transmission.

圆柱蜗杆斜齿轮传动是在传统的蜗杆蜗轮传动中用斜齿轮取代蜗轮而形成一种新的蜗杆传动形式。

The results are: 1 the stricture of the capillaries of stria vascularis was observed in most cochleae of rickety rats and, segmental deletions of the outer hair cells on the first turn of cochlea were found in a small number of rickety rats; 2 the perilymphatic ionized calcium concentration significantly re- duced and the threshold of CAP (Compound Action Poten- tials of the eighth nerve) significantly rose in rickety rats in comparison with those of normal control; 3 gentamicin results in an increase of the perilymphatic ionized calcium concentra- tion in rickety rats; 4 the cochleae of the rickety rats appeared to be less vulnerable to the ototoxicity of gentamicin than the normal one.

研究包括两个方面，其一是&佝偻病的感觉神经性耳聋及其对庆大霉素耳毒性作用的耐受性&，系用大白鼠建立维生素D缺乏性佝偻病动物模型，发现：（1）佝偻病大白鼠耳蜗血管纹毛细血管狭窄，少数动物耳蜗底回外毛细胞有节段性缺失；（2）佝偻病大白鼠的耳蜗鼓阶外淋巴钙离子浓度降低，CAP（听神经复合动作电位，以下简称CAP）听阈提高；（3）庆大霉素可使佝偻病大白鼠耳蜗外淋巴钙离子浓度上升；（4）佝偻病大白鼠耳蜗在功能和形态上都比正常者更能耐受庆大霉素的耳毒性损害。

The helix angle on the worm is generally quite large, and that on the gear very small.

蜗杆上的齿斜角度通常很大，而蜗轮上的则极小，因此习惯常规定蜗杆的导角，那就是蜗杆齿斜角的余角；也规定了蜗轮上的齿斜角，该两角之和就等于90度的轴线交角。

Therefore, many researches have been taken on the theory and manufacture of worm transmission, including the research on new tooth profile, new drive type, tooth cutting and measuring, lubrication, material and heat treatment, design, calculation, simulation analysis and optimization.

蜗杆传动在理论和加工方面都有较广泛深入的研究，如：新的啮合齿形和新的传动类型的研究；以蜗杆副的加工制造和测量为主要内容的生产实践研究；对蜗轮蜗杆油品和蜗杆副材料的研究；以计算机应用为特点的设计计算、仿真分析、优化等研究。

Central China in the design and manufacture of worm reducer there is a process to a large extent the shortcomings, as revealed by the paper, important issues such as: cutting the root of the tooth; Worm rough the correct design of the worm check.

国内在设计制造环面蜗轮蜗杆减速器过程中存在着很大程度上的缺点，正如论文中揭示的那样，重要的问题如：轮齿的根切；蜗杆毛坯的正确设计；蜗轮蜗杆的校核。

Central China in the design and manufacture of worm reducer there is a process to a large extent the shortcomings, as revealed by the paper, important issues such as: cutting the root of the tooth; http://www.16sheji8.cnWorm rough the correct design of the worm check.

国内在设计制造环面蜗轮蜗杆减速器过程中存在着很大程度上的缺点，正如论文中揭示的那样，重要的问题如：轮齿的根切；蜗杆毛坯的正确设计；蜗轮蜗杆的校核。

Central China in the design and manufacture of worm reducer there is a process to a large extent the shortcomings, as revealed by the paper, important issues such as: cutting the root of the tooth; http://www.16sheji8.cn Worm rough the correct design of the worm check.

国内在设计制造环面蜗轮蜗杆减速器过程中存在着很大程度上的缺点，正如论文中揭示的那样，重要的问题如：轮齿的根切；蜗杆毛坯的正确设计；蜗轮蜗杆的校核。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。