Thus , the paper zeros in on end users , the direct targets of information service , to analyze their characteristics and the diversity and complexity of their information needs in light of the informationized environment in which networked information search services arose and of the evolution of these services . based on this analysis , the paper goes further to make an in - depth , detailed comparative study of two well - known information service systems , i . e . oclc firstsearch and dialog 因此，本文选取信息服务最直接的对象? ?最终用户作为研究的视角，在阐述网络化信息服务形成的信息化环境及信息查询服务发展变化的背景下，分析最终用户的特征及其信息需求的多样性和复杂性，在此基础上，对国内外两个著名的信息服务系统oclcfirstsearch (第一检索)和dialog进行了深入、细致的对比分析。
To foreground my argument , i shall argue that under appreciated , if not completely overlooked innovations in food storage , processing , transport , preservation , finance , and marketing may have meant more in economic and social terms than the developments agricultural historians have traditionally chosen to zero in on : crop cultivation and the raising of livestock 我将指出：被忽视、甚至被完全无视的食物贮藏、加工、运输、保鲜、金融、和销售等方面的各种发明，比农业史学家们传统地关注的农作物和畜牧业的各种发明可能更具有经济和社会的重要性
