The second part includes two chapters . the first chapter focuses on analyzing features of school management system in china and abroad . the second chapter includes three aspects , including tendencies of modern society development , values of modern secondary education , and functions of modern secondary school management 这部分分为二章，第一章着重分析了二十世纪五十年代以来国内外中学管理制度的特点，第二章主要探索了现代中学管理制度的背景，从现代社会发展的主要特征、现代中学教育的核心价值、现代中学管理的基本功能三个方面进行了探索。
In this article , based on the theory of " integrated plurality of the chinese nation " and the review of the development situation of the basic education in xishuangbanna from 1950s " to this day , the author finds and summarizes the present main problems in existence of basic education of the dai nationality in xishuangbanna : lower proportion of students entering schools of a higher grade , lower rate of qualified , higher rate of drop - of , grave study - weariness of the student , etc , analyzes the main reasons resulted in such main problems from the aspects of general character ( the general concept , the outdated mode of production , the needy foundation of preschool education , the problems of the school , the bad effect resulted from the present education system , etc . ) and specific character ( dai ' s special concepts , the richer life , religious factor , some of the dai ' s social custom , language barrier , the negative attitude of sending the child to school of the parent , etc . ) compared with the other nationalities and the negative effect to the local dai ' s culture and economic development 本文以“中华民族多元一体格局”理论为基础，以西双版纳傣族基础教育当前的主要问题为切入点，在回顾西双版纳傣族自二十世纪五十年代以来基础教育发展概况的基础上，发现并总结了西双版纳傣族基础教育当前主要存在学生入学率和升学率低、辍学率高、厌学情况严重等问题，分析了产生这些问题的傣族与各民族存在共性的（普遍观念、现行生产方式、学前教育基础薄弱、学校教育失误、现行教育体制存在弊端等）和具有傣族特征（傣族特有的一些观念、相对富裕的物质生活、宗教因素、社会习俗、语言习惯、家长对子女入学的消极态度等）的主要原因及其对本民族经济、文化发展的影响，并就当前主要问题，从促进西双版纳傣族乃至整个中华民族发展的高度，结合当前实际，对与基础教育发展关系较为密切的三个主要方面即政府职能部门、教师和傣族群众提出了一系列可行性对策建议。
Sun learned wu hao style t ai chi chuan from hao wei - chen , who was li i - yu s chief disciple . sun started studying with hao relatively late in his life , but his accomplishments in the other two internal arts led him to develop his t ai chi abilities to a high standard more quickly than is usual . he subsequently was invited by yang shao - hou , yang cheng - fu and wu chien - chuan to join them on the faculty of the beijing physical education research institute where they taught tai chi to the public after 1914 二十世纪五十年代初期，北京武术界成立过联谊会，会址设在德胜门内北京汇通武术研究社，每逢北京武术界举行联谊大会演时，李瑞东先师的入室弟子、汇通武术研究社社长、著名武术家高瑞周老师出场表演他拿手的低架慢拳，就是李式太极拳（太极五星锤） ，获得了武术界的好评。
Pb ( zr , ti ) o _ 3 ( usually abbreviated as pzt ) , one of ferroelectric films , appeared in the beginning of the fiftieth . because varying the ratio of zr / ti or adding impurities can improve its properties , pzt was focused by the scientists all over the world . based on the previous experimental theories , we first study the properties of the pzt thin film the ratio zr / ti of which is 94 / 6 in this thesis Pb ( zr ， ti ) 0 _ 3 ， (通常简写为pzt )是二十世纪五十年代初出现的一种铁电材料，由于其介电、铁电、压电及热释电性可通过改变zr ti的份量比以及掺杂的方法得到改善，因此倍受国内外的关注。
Transplantation has been developed to an effctive strategy for treatment of end stage diseases of multiple organs since 1950 ' s . despite success of current immunosuppressive drugs , transplantation immunologists and surgeons are still seeking to achieve tolerance to allograft . there are several different mechanisms such as clonal deletion , anergy , neglect , immuno regulation . which maintain tolerance to self - antigen . some strategies , derived from these mechanisms has been proved to be encouraged in suppression of allograft rejection 二十世纪五十年代以来，器官移植的进展使同种异体器官移植成为治疗多种器官终末期疾病的有效手段。尽管目前免疫抑制方案非常有效，但免疫耐受仍是移植免疫学家和外科医生关注的课题。有多个机制使免疫系统对自身抗原保持耐受，如：克隆清除、忽略、失能、免疫调节。
