in the end 相当于 at last, finnaly, 是副词,意思是"最后,最终,终于"如:
In the end, she found the solution to the problem. (最后,她找到了解决这个问题的方法.)
at the end通常后边要跟上其它成分,即完整的形式是: at the end of sth,意思是"在...的末尾,在...结束的时候",如:
At the end of the month, she finished the task. (在月末的时候,她完成了任务.)
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