种球

The initial activity is only a game, the ball is Qinger flexible materials, beat cigar lid-like wooden board, the same as in table tennis playing, it called the "table tennis ." Around 1900, due to the development of light industry, the ball was replaced by the hollow ball made of celluloid.

最初只是一种活动性游戏，球是用轻而富有弹性的材料制成，拍子阳雪茄烟盒盖之类的木质板，象打网球一样在桌上打，故称之为"桌上网球"。1900年左右，由于轻工业的发展，球才改成用赛璐珞制成的空心球。

This may be a testament to his belief in his fastball, which is a very solid pitch with plus velocity.

这也许是他对他的快速球有信心的证明，他的快速球拥有略高於平均值的球速，是一颗很有威力的球种。

Movement: May have the best movement of any fastball in the major leagues — when it's right.

球的动态：可能是全大联盟中任何一种快速球中动线最佳的—当球跑得对的时候。

Thi s method can detect the edge of the raw material globule effectively.

本文基于计算机图象识别技术，提出一种在线测定生料球粒度的新方法，解决了料球图象识别的关键问题――料球的边缘检测。

Objective In order to store N.gonorrhoeae economically and simply for research, we developed a fresh milk method to preserve gonococcus.

目的 为了经济、简便地贮藏淋球菌以利于对淋球菌进行研究，我们研制了一种主要成份为鲜奶的保存淋球菌的简便方法—鲜奶法。

Posada admitted by the end of last year some hitters were sitting too much on Wang's sinker, and that, combined with whatever drop his bread-and-butter pitch lost by the end of last year, made Wang more hittable, not just very predictable.

小波承认在上个赛季的最后，一些打者锁定了小王的伸卡球，这使以伸卡球为主的小王输掉了上赛季最后的比赛，更多的球种也使小王更耐操，不会简单的被猜中。

At the same time, due to 2~1S_0、 3_1S_0 are the radical excitations of 1~1S_0,we can use Regge trajectory on the (n,M~2)-plane with the approximate same slope to describe the mass of isoscalar of 3~1S_0 nonet (1926MeV). The two results derive from different ways are approximate. 2 The mass of the isodoublet of 2~3S_1 nonet is analyzed in the quarkonium-quarkonium mixing scheme, the results (1584±16.7MeV) is far from the K~*(1410)(1414±15MeV). 3 Based on "glueball dominance" picture, we establish glueball-meson mass relations. For the 2~ glueball mass and 4~ glueball mass used as input parameters, these relations predict the mass of isoscalar of 1~3F_4(4~)(2076±19.66MeV).

的质量(1900±12MeV)；同时考虑到2~1S_0、3~1S_0为1~1S_0的径向激发态，在(n，M~2)雷吉轨迹图中应该具有近似相同的斜率，利用雷吉轨迹可以得到其对应质量为(1926MeV)，两种方法得到了两个十分自洽的结果。2在介子—介子混合框架下，对2~3S_1介子九重态中同位旋二重态的质量给出估计，得到(1584±16.7MeV)，这个结果相对于K~*(1410)=1414±15MeV有较大的偏离。3在胶球为主的图像下，利用介子—胶球质量关系，选择2~与4~胶球的质量作为输入参数，我们得到1~3F_44~(介子九重态中同位旋标量态？

It has great potentialities in such fields as micro-optics, integrated optics and optics communication.Firstly, based on the basic theory of GRIN optics the optical effects of the spherical symmetry GRIN micro-sphere lens were analyzed systematically.

本工作从梯度折射率介质光学的基本理论出发对球对称GRIN微球透镜的光学性能进行了系统分析；选择两种适当单体，采用悬浮扩散共聚法制备出聚合物梯度折射率微球透镜；测量所得透镜的折射率分布曲线和其他光学参数。

Luneberg lens is a spherical lens which its permittivity varies with normalized radial coordinates. It is fabricated by using different homogeneous dielectric centrically layered media. The lens can focus a parallel beam of rays from any direction exactly at a point on the surface. If it is made by adding a reflecting surface "metallic cap", it is called Luneberg lens reflector. It can reflect incident wave into plane wave in incoming direction. It is usually applied in antenna, radar reflector,satellite-based, and mobile-communucation.

龙伯球透镜为一种介电系数与半径成一固定比例的球形透镜，大部分是由数层不同介电系数介电质组合而成，而其主要特性能够把入射波聚焦到球表面一点，假使在透镜表面处镀上一圆锥角金属层即为龙伯球透镜反射器，能把入射波依平面波的型态反射回原入射端，通常用於天线、雷达、卫星通讯、军事等方面。

Valve type Use the search for a match with Forged Steel Valves the valve, should first look at four kinds of basic types of throttle control valve, that is, cage ball, rotating ball valve, eccentric butterfly valve and valve.

阀门类型在寻找一种与使用场合相匹配的阀门时，首先应考察一下4种基本型式的节流控制阀，即笼式球阀、旋转浮球阀、偏心阀与蝶形阀。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。