As teenagers , college students and young adults have flocked to the social networks , advertisers have increased their spending at those hip hangouts instead of older , all - purpose sites like yahoo 青少年，大学生和年轻的成年人已经涌向社会网络，广告商不是把增加的投入到雅虎这样的目的指向性的站点，取而代之的是那些新潮的被频繁光顾的网站。
It has six basic features , i . e . the precursor of its development , the speciality of its subject , the broadness of its content , the variety of its form , the guidance of its objective and the creativeness of its transmitting 大学校园文化有六个方面的特征，即发展的先导性、主体的特殊性、内容的广阔性、形式的多样性、目标的指向性、传递的创新性。
The main contribution of this study lies in the third part which gives a whole look at the design and implementation of a multi - channel preprocessing system for underwater acoustic signals , the key techniques were given in details 实现了改进后的实验数据预处理功能，可在实验的同时进行水听器指向性的绘制和数据块的分割，提高了采集设备对数据的处理能力。
This series employs knot - shaped bi - phase system of high frequency driver , co - axial technology , constant pointing horn to obtain even transmission of frequency within pointing angle , and near / far field strength - adjustable dance horn technology 采用了高音驱动器的“桔状双相位系统” 、同轴技术、在指向角范围内得到均匀传送频率特性的恒定指向性号角，远近声场可变强度舞蹈号角技术。
2 . study the working principle of the vector transducer , mainly for two - dimensional pressure - gradient transducer . and the experimental results for directional pattern of two - dimensional pressure - gradient vector transducer at frequency 3khz and 5khz are given 重点对本文所要研究的压差式矢量水听器进行研究，并运用消声水池实测数据绘出了二维压差式矢量水听器在3khz和5khz下的指向性图。
The analytic result derived by studying the vertical directional property shows that , the vertical sensitivity distribution is homogeneous and the fluctuation is 0 db in theory . the fluctuation observed in experiments is less than 0 . 3db , which agrees well with that in theory 垂直指向性分析结果表明,光纤水听器垂直方向的灵敏度分布是均匀的,理论上波动应为0db ,而实验测得的垂直方向的指向性波动小于0
