种球

Okay, so now we have some idea as to what pitchers should be throwing.

好的，现在我们对投手该投哪些球种有些概念了。

In this chapter, three kinds of target recognition methods are performed, which are:①Target recognition method based on the description of polarization parameter plane. The echo polarization states of target are projected onto the polarization state plane described by the ellipticity ε and the tilt angle τ of the polarization ellipse, the change of parameter following ferquency becomes the chart. According to the changing trait of the chart, the multidimensional polarization feature space of target has been contructed. Furthermore, a series of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.②Target recognition method based on the description of Poincare polarization sphere. The echo polarization states of target expressed by Stokes vector are projected onto the Poincare polarization sphere. The conception of polarization ferquency stability, which is used in describing the dynamic distribution characteristics of the target echo polarization states on Poincare polarization sphere, has been defined. A group of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.③Target recognition method based on the description of frequency sensitivity. In accordance with the conception of the polarization state distance defined on Poincare polarization sphere, the frequency sensibility of the physical structure property of target has been investigated, the frequency distribution feature curves in PSD domain are obtained, and targets'features are extracted by means of the curve-fitting method with Least Square Criterion.

这章具体研究了基于三种极化散射特性描述的相应的目标识别方法：①基于极化参数平面描述的目标识别方法，将目标回波极化状态投影到以极化椭圆参数，即椭圆率角ε和倾角τ表征的极化状态平面上，参数随观测频率的变化就形成了图，根据图的变化特点构造了目标的多维极化特征空间，并提取了不敏感目标姿态变化的极化特征参数组来设计目标的识别器结构；②基于Poincare极化球面描述的目标识别方法，采用Stokes矢量表征目标回波的极化状态，并将其投影到描述极化状态的Poincare极化球面上，定义了极化频率稳定度的概念用以刻画目标回波极化状态在Poincare极化球面上的动态分布信息，提取了准方位不变性的目标极化特征，最后设计了目标的识别器结构；③基于频率敏感性描述的目标识别方法，通过在Poincare极化球面上所定义的极化状态距离的概念，研究的是复杂目标物理结构特性对探测信号频率的敏感程度问题，获得了在极化状态距离下的频率分布特性曲线，采用最小二乘估计曲线拟合方法，它既用于极化特征的降维，同时又直接将拟合参数作为目标的分类特征。

From 10,000 years ago to 7,000 years ago, Hemudu ancestors who had come along in the splendid rising sun and abundant rains of the brand-new century would not be the hunters only that had no definite residence and depended on heaven for food any longer, besides for traditional tools including sticks, stone balls, bows and arrows, actually what used more were those very efficient farm tools such as bone ploughshare, bone sickles and wood pestle etc. for the purposes of weeding, earth digging, leveling up fields and planting rice, reaping and threshing, in addition, they raised livestock such as pig, dog and bull etc.

从1万年前，沐浴着全新世的绚丽朝阳和丰沛雨水一路走来的河姆渡先民，到了7000年前，再也不仅仅是居无定所、靠天吃饭的采集狩猎者，他们手里除了木棒、石球、弓箭等传统工具以外，更多的已经换成了除草掘土、平田种稻、收割脱粒的骨耜、骨镰、木杵等效率不错的农具，而且还饲养了猪、狗、牛等家畜。

The metal bob of a plumb line.

一种在铅锤线下的金属球。

The metal bob of a plumb .

一种在锤下的金属球。

A plumb line attached to a narrow board.

一种在铅锤线下的金属球。

The Shenzhen East Athens Business Hotel with modern amenities and elegant decoration was built according to five stars standard. There is nearly 20000 square meters business acreage; it costs nearly a hundred million RMB in investment. Centralize the east and west culture distillate and design style. Dignity plunge bath, jade waterpeopleamorous feelings; the Athens theatreis resplendent and magnificent; moreover, it has a wild range of classic Chinese and Western appetizers. it has individually businesshouses,sauna,hydropath SPA, hairdressing, tea arts,chess, balls, books and net bars and so on.Multifunctional, large-scale and all-round business hotel brings you into a Xanadu to relax.

按五星级标准装修，经营面积近两万平方米，投资过亿元，汇集东西文化精髓，中西合壁的设计格调散发着时尚典雅的艺术气息，丰采雍雅的浴池、推珠砌玉的碧波，荡漾着万种风情；精彩纷呈的雅典剧场，风味十足的美酒佳肴，倍感浪漫的雅典风情；极具个性的商务客房、中西餐酒店、桑拿保健、水疗SPA、卡拉OK、美容美发、棋牌、琴吧、球吧、书吧、网吧、康乐健身、多功能影院为一体的大型综合性商务酒店，带您进入一个彻底放松身心的世外桃源。

During the Hmong New Year celebration, the Hmong ball tossing game ''pov pob'' is a common activity for adolescents.

在苗族新年庆祝活动，苗族球投''游戏''过氧化值pob是一种常见的活动对青少年的教育。

There were concerts, amateur performances in colorful native dance garb and Pov Pob ball tossing, a courting game that Hmong boys and girls play to help them find marriage partners.

活动上有许多音乐节目，有穿着艳丽的民族服饰业余舞蹈爱好者表演的舞蹈，还有一种叫Pov Pob的郑球游戏，男孩和女孩可以通过这种求爱游戏帮他们找到自己的眷属。

A basic rock whose pockmarked appearance is caused by the presence of numerous white,rounded,embedded spherules.

球颗玄武岩一种基性的岩石，其有麻窝的外表是由无数白色，圆形嵌进去的小球的存在连成的

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。