[译] 他们吃着谈着用了大约两小时。最后他们决定跳舞了。
[误] They ate and talked for about two hours. At last they decided to dance.

[正] They ate and talked for about two hours. Finally they decided to dance.
[注] finally 和 at last 都是"最后"的意思，但 finally 通常用来指在一连串的动作发生之后的最后一个动作，尤其是在列举时说到的最后一点，如 firstly, secondly…，finally（首先，其次……，最后），而 at last 表示"最终，最后"，与 first 相对。