ADV 首先;第一 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. 首先;第一
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The programme is now seven years behind schedule as a result, firstly of increased costs, then of technical problems.
该项目现已经比预定时间晚了7年,原因首先是因为成本增加,其次是由于技术问题。
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Vitamin C has many roles to play in weight control. Firstly, it is needed for hormone production.
维生素C在控制体重方面扮演着多重角色。首先,荷尔蒙的生成有赖于它。
SYN in the first place, initially, to begin with, to start with
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