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backlogs
A backlog is a number of things which have not yet been done but which need to be done.
There is a backlog of repairs and maintenance in schools.
学校里有积压下来等待处理的维修和养护工作。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。