种球

A pulsar is a celestial object that emits light in short burst a pulsar in the crab nebula flashes at a rate of 30 times/s,suppose the light pulses are caused by the rotation of a spherical object that emits light from a pair of diametrically opposed "flashlights" on its equator.

脉冲星是一种以短爆发形式辐射光的天体。假设球型天体赤道面上有一对&发光塔&，并且这对发光塔的联线构成赤道面的直径，进一步假设光脉冲产生于球形天体的转动，那么巨蟹座星云中的一个脉冲星的闪光频率是每秒30次。

In this paper an innovative method for machining sculptured surfaces is presented. By using a disc cutter with a concave end instead of traditional ball-ended or drum-shaped tools, and adjusting the cut- ted axis to swing relative to the component being machined under some special rules, the envelope formed by the trace of the tool-nose may have the same derivative up to the third order as the required theoretical surface.

本文提出了一种加工自由曲面的新方法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1～3阶导数，从而在保持精度不变的前提下，使实际行程次数得以大幅度的减少。

Rugby football is played with an egg-shaped ball. It can be a dangerous game as players wear no protective clothing.

英式橄榄球使用的是一个鸡蛋形的球，由于球手不穿防护外衣，使得该运动成为一种很危险的运动。

The present invention pertains to an improved nozzle for use in wear-resistant rotary atomizers and to atomizer wheels containing said improved nozzles. Said atomizer wheels and nozzles have the same wear resistance as the ones described in the prior art or even better, but at the same time, the nozzles have been improved to provide microspherical particles with a very narrow particle size distribution.

本发明涉及一种用于耐磨旋转雾化器的改进的喷口以及包括所述改进喷口的一雾化轮；所述雾化轮和喷口具有与现有技术中所述的相同甚至更好的耐磨性，但同时喷口改进成可以提供具有非常窄的颗粒尺寸分布的微球颗粒。

vanced a new approach to measure the coefficient of viscosity with the method of falling balls , and explained the movements of falling balls of the same diamters in viscose fluid in tubes of different diameters and falling bahs of different diameters in viscose fluid, as well as the whole process of movements of falling balls in viscose fluid.

文摘：给出了一种落球法测液体粘滞系数的改进方法；并对小球在不同管径内的粘滞液体中的下落运动、不同直径的小球在粘滞液体中的下落运动以及小球在粘滞液体中的整体运动过程等进行研究。

The present invention relates to grinding ball of bainite ductile iron and its production process.

本发明涉及一种贝氏体球墨铸铁磨球及其生产工艺。

The innovative Orbitor rotary spray ball, the latest addition to the range of products supplied by nozzle specialists BETE Ltd, is a patented design which combines high performance cleaning efficiency with extended operating life and reduced life cycle costs.

创新的O r b i t o r旋转式喷球，是喷嘴专业公司B E T E有限公司供应的系列产品中最新开发的一款，是一种结合了高性能清洗效率、延长的工作寿命和降低的寿命周期成本的专利设计。

A method of hitting the Bludger backwards, difficult to pull off with any precision but very effective for disorienting opponents, who don't expect a Bludger to come at them in that way QA52

一种把游走球向后打的方法，很难准确到位，但却是迷惑那些不希望游走求医那种方式朝自己飞来的对手的很有效的手段。

PCR with Family special primers was carried out to identify Family of PspA, and Clade of PspA was identified by means of bioinformatics according to the sequencing results.

通过家族专属引物PCR的方法鉴定这5种荚膜血清型肺炎球菌的PspA蛋白所属家族，并进一步根据基因测序结果通过生物信息学方法鉴定了所属支系。

The game allows three modes of control for the racket and gives you achoice of racket, table and decors.

这款游戏提供三种球拍控制方式，并且你可以选择球拍、球桌和比赛场景。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。