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Most of hob design for non-involute gears are nowadays taken by approximation method.For example,the normal sectional profile of hob worm therad is usually regarded approximately as its basic rack profile.Recently, some new methods have been developed in this respect but, perhaps, they appear overelaborate since the principle of spacing engagement is based on. For this reason , the paper offers a new design procedure for hob worm based on the planar engagement principle with the intention of simplific...

本文应用平面啮合原理精确设计各种非渐开线齿轮滚刀的基本蜗杆，提出并应用啮合线的投影原理从工件齿轮端截面的啮合线直接求得刀具蜗杆的端面齿形，而不必求出媒介齿条的齿形，方法很简单，还从啮合线的投影原理简明而形象地证明了一对螺旋齿轮直接啮合过程的啮合线是一条垂直于齿向的平面曲线。

In a cross-sectional study, the researchers used dual energy X-ray absorptiometry to compare measures of body composition and BMD in 28 girls with Turner syndrome who had neer receied GH and 39 girls who were treated with GH for at least 1 year. Hand radiography was used to compare phalangeal cortical thickness.

在一个代表性的研究中，研究人员利用双能X-线吸收仪分别测量28个没经生长激素治疗的患有Turner综合症的女孩和39个经生长激素治疗至少一年的患有Turner综合症的女孩的机体组分和骨矿物质密度，同时用手X线机测量她们的指皮质厚度。

Comparing with the control group, the quantitative criteria including the thickness ratio and the cross-sectional area at the level of pisiform bone was significant.

超声检查可以从形态、量化指标两个方面鉴别诊断CTS，可以发现局部致病病因及解剖变异，为手术方式选择提供帮助。

Resultsthe level cross-sectional area of the median nerve at the pisiform bone in the cts patients of the observation group was significantly higher than that of the normal control group and the flat rate of the observation group was significantly higher than that of the normal control group. the high-frequency ultrasound diagnostic sensitivity was 80.4%(lower than the sensitivity of the conventional electrophysiological examination),with painless,non-invasive characteristics of dynamic ultrasound imaging and lower cost.

结果 cts患者正中神经在豌豆骨水平截面积明显大于正常对照组；观察组的扁平率明显高于正常对照组；高频超声检查的诊断敏感度为80.4%，不及常规的电生理诊断敏感度；超声可以动态成像，无痛无创，费用较低。

The purpose of this study was to understand the influence in women who were faced the medical decision of hysterectomy. This was a cross-sectional study. One hundred patients were selected purposively from three hospitals at eastern and north-eastern region of Taiwan.

本研究目的在了解多媒体影音光碟介入对妇女行子宫切除手术医疗决策之成效，采横断式研究方法，立意取样以东部某两家医院与东北部某医院病患为样本，共收有效问卷100份，利用结构式问卷及深入访谈进行研究。

We have plans to reupholster our sectional sofa in the coming weeks, we're just still searching for the perfect fabric.

我们还计划在这几周装饰一下我们那可以组合的沙发，我们依旧要寻找合适的完美的纺织物。

Romero noted that the population was predominantly white, and the study was a cross-sectional analysis.

Romero 博士指出，这一研究的局限性在于，它只是一个横向分析，且研究对象多为白人。

Its metering principle is that the rotation of premary instruments' roter sents out magnetic pulse signal,then the received signaI by the flow sensor monitor changes into electric signal, Through microcomputer integrating, data processing, after error sectional revision the result displayed.

该流量计的测量原理是：一次表转子旋转发出磁性脉冲信号，由流量传感探头将接收到的脉冲信号转变为电信号，经微电脑积算、数据处理、误差分段修正后显示出。

Digital photography was done, data saved in computer, seriate sectional photographs on an oblique sagittal plane obtained and the tympanic and mastoid segment of facial nerve observed.

目前，我国耳显微外科的整体水平还不高，有关颞骨内鼓乳段面神经的基础和临床研究的深度和广度还不够。

The study of leaf epidermis at the sectional level on Chinese Setaria.

标题 叶表皮细胞结构在国产狗尾草属分组水平上的应用。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。