in the end，最终，after all，at last, finally, ultimately
at the end，末端; 尽头，extreme limit
at an end，结束，终结，finished
in the end 更加抽象，一件事情，一个时期的最后。
牛津例句：In the end, they decided to spend the holiday at home
牛津例句：He tried many different jobs; in the end he became a postman.
at the end 更加具体，地方的尽头，时间的尽头，电影的结束
比如： the house at the end of the street， at the end of the day, month, year
牛津例句：Turn into Hope Street and our house is right at the end
at an end，搭配be动词使用
牛津例句：The war was at an end. 战争结束了。
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