Countermanding
v. 取消（命令）, 撤回( countermand的現在分詞 )
??? 情景例句
There are abundant free materials available on the internet.
因特網上有豐富的免費資料提供。
It takes two to tango.
一個巴掌拍不響。
The man said that the pen was worth $50,
那人說那支筆值50英鎊，