cancel [ˈkænsl] vt./vi. 意思是“取消, 撤销, 终止”，指决定不去做事先已经安排好的活动或事情 (to decide that sth that has been arranged will not now take place)，例如:
cancel a meeting 取消会议cancel the wedding 取消婚礼cancel a contract (an order) 取消合同 (订单)The final flight was cancelled. 最末航班被取消了。No charge will be made if you cancel within 10 days. 如果在10天以内取消，不收费用。The project has been cancelled because of lack of funds. 这个项目因缺乏资金已经撤销。
delete [dɪˈliːt] vt. 是”删除, 删掉”， 如删除书写的内容，或从电脑/手机里删除文件、照片、电话号码等 (to remove sth that has been written or printed, or that has been stored on a computer)。例如：
Mr / Mrs / Ms ( delete as appropriate ) 先生 / 太太 / 女士（酌情删除）The editor deleted two paragraphs from the article. 编辑删除了文章中的两段内容。Please delete the unnecessary content in the report. 请删除报告里不必要的内容。He deleted all the files in his PC. 他删除了个人电脑里的所有文件。
erase [ɪˈreɪz] vt. 是“抹去 / 擦去” (to remove from memory or existence; to wipe out digitally or magnetically recorded information; to remove by or as if by rubbing or erasing)。例如:
erase a disc 抹去光盘上的信息erase a memory 忘却一段记忆erase the words on the white board 擦掉白板上的字He had erased the wrong word. 他擦去了写错的字。It was unfortunate that she had erased the message. 不幸的是她已经删除了那条短信。Parts of the recording have been erased. 部分录音已被抹掉。I cant erase you from my mind. 我无法把你从脑海里抹去。And I hate the thought of finally being erased. 我痛恨最终被你从记忆中抹去。(“Best Of Me”歌词)比较：Your name has been deleted from the list. 你的名字已从名单上删掉。His name was erased from the list. 他已被除名。(前者只表示从名单里删掉或去除名字，后者则暗指取消/去掉人名背后的名义、身份、资格等。)
From “唱学英语”公众号，链接：【词义辨析】cancel, delete, erase 的用法与区别
