firstly
🇬🇧/ˈfɜːstli/ 🇺🇸/ˈfɜːrstli/ 10四级六级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. 第一 (演讲、文章中用于列举条目); 首先
adverb [程度副词]（用于引出一系列陈述）首先，第一
The programme is now seven years behind schedule as a result, firstly of increased costs, then of technical problems.
该计划现在比预定的计划晚了7年，首先是因为费用增加，其次是由于技术问题。
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