This phrase goes back to the mid 1300’s. It refers to something that a person cannot coax life out of. A doornail was the metal that was used on old European doors when someone would knock to see if anyone was at home. Now, it refers to machinery or equipment that no longer works. ‘It’s as dead as a doornail’.
像門釘一樣毫無用處
這個片語要追溯回1300中期。在古歐洲，門釘是用來敲門的一種金屬. 現在泛指當一個機器或者是設備不再能夠使用時我們會形容他說”就像門釘一樣毫無用處”