Learner's definition of FIRSTLY
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used to introduce a statement that is the first in a series of statements(用于引出一系列陈述)首先,第一,第一点 ◊ Firstly is chiefly used to begin lists and is usually followed by secondly, thirdly, etc.*firstly主要用于列举的开始,通常接secondly、thirdly等。
◊ In U.S. English, first is more common than firstly in this use.在美国英语中,表达此意,first比firstly更常见。
— compare lastly, secondly, thirdly