这次旅行因两个原因被取消了。第一，天气很糟糕；第二，几位关键人物生病了。
The trip was canceled for two reasons. Firstly, the weather was terrible, and secondly, several key people got sick.
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secondly英 /ˈsekəndli/|美 /ˈsɛkəndli/
解释
secondly 是副词，由序数词 second（第二）加上后缀 -ly 构成，用于列举时表示"第二点"或"其次"。在列举事项时，常用 firstly...secondly... 这样的结构来依次说明原因或要点。
The trip was canceled for two reasons. Firstly, the weather was terrible, and secondly, several key people got sick.
secondly 是副词，由序数词 second（第二）加上后缀 -ly 构成，用于列举时表示"第二点"或"其次"。在列举事项时，常用 firstly...secondly... 这样的结构来依次说明原因或要点。