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新东方-柯林斯雅思备考词典
firstly
英 [ˈfɜːstli]
[ADV]
1. 第一，首先（演讲、文章中用于列举条目） , 首先
You use firstly in speech or writing when you want to give a reason, make a point, or mention an item that will be followed by others connected with it.
双语例句
例：The programme is now seven years behind schedule as a result, firstly of increased costs, then of technical problems.
该计划比预定的时间晚了七年，首先是因为费用增加，其次是由于技术问题。