CNKI provides global users with a unified search and discovery service for Chinese academic resources such as journals, dissertations, yearbooks, conference papers, e-books, newspapers, e-books, and reference books, and supports various full-text download methods.

中国知网（CNKI）国际版面向全球用户提供中国学术期刊、学位论文、年鉴、会议论文、电子书、报纸、电子书、工具书等学术资源的统一检索与发现服务，并支持多种全文下载方式。

2024年10月2日 · The United States Mint honors our nation’s presidents by issuing $1 coins featuring their images in the order that they served. The program began in 2007 with Presidents Washington, Adams, Jefferson, and Madison.

CNKI翻译助手是“中国知网”开发制作的大型在线辅助翻译系统，汇集从CNKI系列数据库中挖掘整理出的800余万常用词汇、专业术语、成语俚语等中英文词条以及1500余万双语例句，形成海量中英在线词典和双语平行语料库。 数据实时更新，内容涵盖自然科学和社会科学的各个领域。

One-dollar coins, both in silver and base-metal forms, have never been popular in circulation from the 19th century to the present, despite several attempts to increase their usage since the 1970s, for various reasons: From 1792 to 1803 the $1 coin compared favorably with the Spanish dollar and was accepted at par for overseas purchases.

中国知网提供学术、专利、标准等知识资源的检索、浏览、下载和订阅服务。

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2024年11月25日 · The vast majority of modern $1 coins in the United States are only worth one dollar. There are exceptions to this rule, such as old silver dollars. Over the past 50 years, dollar coins have not been popular with the public as collectibles. Nor have they been used very much as circulating money.

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2019年10月3日 · Pronounced as the words check in. CKIN (uncountable) Used as a status code on airline reservation systems to indicate that a ticket holder has checked in for a flight, or used to direct SSR requests to the check-in staff at an airport. This page was last edited on …