一、视频下载
二、在线字典
Linguee | Dictionary for German, French, Spanish, and more
Dictionary by Merriam-Webster: America's most-trusted online dictionary
Online Etymology Dictionary | Origin, history and meaning of English words
Linggle 10^12- Language Reference Search Engines - NLPLab
Thesaurus.com | Synonyms and Antonyms of Words at Thesaurus.com
Dictionary.com | Meanings and Definitions of Words at Dictionary.com
三、PDF工具
PDF转换神器(各个格式文件相互转换、合并、压缩、编辑、水印) - 知乎
PDF Converter - Convert files to and from PDFs Free Online
最好用得PDF to DOC – Convert PDF to Word Online
四、英文检查工具
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