One way to hold this word: a road you can walk or drive along until, quite suddenly, it stops. A wall, a fence or a building stands in front of you. Nothing is broken and nothing is wrong with the road — it simply does not go anywhere new. Three things live in that picture: you were moving forward, you cannot move forward now, and the only thing left is to go back and try another way. English lends that picture out to talks, searches and jobs.
可以想成一條路走到最後就沒了：前面一堵牆、一排房子，或乾脆是一片空地。路本身沒有壞，只是它不通到別的地方。這個畫面裡有三件事——你本來一直往前、現在走不動了、而唯一剩下的選擇是回頭換一條路。英文把這個畫面借出去用：談判、調查，或一份怎麼待都升不上去的工作，只要「往前沒路、只能回頭重來」，都可以說是 a dead end。
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