The first part mainly discusses and analyzes the tortuous development of the CPI(M) and its hard work for exploring the Indian socialist road.
第一部分主要考察和分析印共(马)的曲折发展历程及其对社会主义道路的艰辛探索。
参考来源 - 印共（马）“人民民主革命”理论与实践研究·2,447,543篇论文数据，部分数据来源于NoteExpress
There is an example of the tortuous nature of the supply chain system in a study of the Apple iPhone by the Asian Development Bank Institute.
亚洲开发银行研究所(Asian Development Bank Institute)对苹果公司(Apple)产品iPhone的一项研究中有一个例子，可以说明供应链体系错综复杂的特征。
The regular education of library science in China has a history of 76 years since 1920. Though its development was tortuous with stagnation for some time, it is now flourishing and modernized.
自1920年至今，我国图书馆学正规教育走过了76年的历史，其间创立了情报学和信息管理学。
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