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Reinforce pipe technic has been widely studied, and most investigations used unidirectional stress field. The Reinforce technic is restricted on using the gyrate of core rod to increase hoop shear stress field, which is easy to cause extrusion instability and forming difficulty, and the production efficiency is far less than that of industry production.

国内外学者就管材的增强技术进行了大量的研究，大多的研究都是采用单方向的应力场进行的；增强技术仅停留在小尺寸口模管材的挤出或芯棒的转动来施加周向应力场，并且工艺上容易造成挤出的不稳定，以及定型的困难，生产效率与工业化相比相去极远。

The gyrfalcon,an Arctic bird of prey, has survived a close brush with extinction;its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.

我只知道numbers是表示总量概念，但是具体是怎么用的也不是很清楚。。贴上LDOCE里面的解释，绿底字部分

Sadly, for all their grand harrumphing, in each of the above cases, habeas corpus still ended up suspended or restricted.

可悲的是，在上述的情况中，所有这些声势浩大的反对呼声，最终都以人身保护令的中止或限制而告结束。

The authors performed 3D photographic measurement on the technical moves of ZHANG Wen-xiu as an excellent female hammer thrower in China to get relatively comprehensive body movement data by using two JVC3000 high-speed cameras, screened and analyzed the data by using SPSS software, and revealed the following findings: in terms of such technical parameters as spinning time, spinning track and spinning speed, there were some problems with this player, which restricted the enhancement of her performance, such as the double leg supporting time was shorter than the single leg supporting time; the angle of inclination of the track of various swirls (espe-cially the first swirl) was somewhat too big; the accelerating process was too short; too much attention was paid to acceleration at the single leg supporting stage; the spinning at the double leg supporting stage was too fast; the sus-tainable accelerating power was not high.

摘 要：采用两台JVC3000高速摄像机对中国女子链球优秀运动员张文秀的技术动作进行三维摄影测量，获得较为全面的人体运动学数据；运用SPSS软件对数据进行筛选和相关分析，发现该运动员在旋转时间、轨迹和速度等技术参数方面存在着一些制约成绩提高的问题，诸如双支撑时间短于单支撑时间、各圈(尤其第1圈)的轨迹倾角偏大、加速过程太短、单支撑阶段过于强调加速及双支撑阶段旋转过快、持续加速能力不强等。

the authors performed 3d photographic measurement on the technical moves of zhang wen-xiu as an excellent female hammer thrower in china to get relatively comprehensive body movement data by using two jvc3000 high-speed cameras, screened and analyzed the data by using spss software, and revealed the following findings: in terms of such technical parameters as spinning time, spinning track and spinning speed, there were some problems with this player, which restricted the enhancement of her performance, such as the double leg supporting time was shorter than the single leg supporting time; the angle of inclination of the track of various swirls was somewhat too big; the accelerating process was too short; too much attention was paid to acceleration at the single leg supporting stage; the spinning at the double leg supporting stage was too fast; the sustainable accelerating power was not high.

运动生物力学在乒乓球运动中的应用与。。。对投掷运动员运动损伤的调查分析与预。。。《运动防病治病讲座》健身运动的基本。。。都市运动研究：理论传统的界定和中国。。。《运动防病治病讲座》中年人的健身运。。。体校学生特征性运动自信心和运动动机。。。中国优秀沙滩排球运动员运动损伤流行。。。摘要：采用两台jvc3000高速摄像机对中国女子链球优秀运动员张文秀的技术动作进行三维摄影测量，获得较为全面的人体运动学数据；运用spss软件对数据进行筛选和相关分析，发现该运动员在旋转时间、轨迹和速度等技术参数方面存在着一些制约成绩提高的问题，诸如双支撑时间短于单支撑时间、各圈(尤其第1圈)的轨迹倾角偏大、加速过程太短、单支撑阶段过于强调加速及双支撑阶段旋转过快、持续加速能力不强等。

Is haulage traffic restricted at certain times, eg rush hour, school times.

运输交通是否被限制在一定的时间段？如：高峰期，学校上课时间。

But,because wire and drive pipe's transmission range of movement after the stress will haunch up or pulls stretches will cause the losses,thus the control distance will be restricted.

但是，由于导线和导管的传动动程在受力后拱起或拉抻会造成损失，因而控制距离受到限制。

The legislation imposed a head tax of 10 pounds on every Chinese migrant entering a Victorian port and restricted their number to one per ten tonnes of a ship's cargo.

立法对每一个进入维多利亚港的华人征收10磅人头税，并限制每只货船的10吨货物，容许一个移民指标。

Not only does the government tightly control pump prices, but it has, so far, severely restricted companies' ability to hedge market risk by buying oil futures.

此外，中国政府不仅控制成品油价格，而且还严格限制公司通过购买原油期货来对冲市场风险的能力。

But the rationalism restricted the Dionysrac Spirit, and this caused the degeneration of Greek tragedy and Hellenism finally.

但是以苏格拉底为象征的理性精神的勃兴压制了酒神精神，最终导致了希腊悲剧的衰亡，也导致希腊文化的衰落。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。