问题描述：
on end
The two experts worked at the task of writing a preface to the new dictionary for three hours on end.
on end是最后的意思吗?
In time与on time 为什么on end.不能换成In time?
翻译成两个专家及时完成任务?
The two experts worked at the task of writing a preface to the new dictionary for three hours on end.
on end是最后的意思吗?
In time与on time 为什么on end.不能换成In time?
翻译成两个专家及时完成任务?
问题解答：
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