on end 这里指连续的意思,in time 是及时的意思,on time 是准时的意思,不能换的.句子的意思是 俩个专家做那个任务连续花了三个小时,那个任务是什么呢,是为一本新字典写序言.
on end The two experts worked at the task of writing a prefa
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