firstly
US
UK firstly adv: (first: introducing first point)
SC 第一 dì yī
TC 第一
TC 第一
SC 首先 dì yī ，shǒu xiān
TC 首先
TC 首先
Kyle wasn't involved in the crime; firstly, he was at school all day, and secondly, he has no motive.
凯尔没有参与犯罪：首先，他当天整天都在学校；其次，他没有动机。
firstly adv: (first: before anything else)
SC 优先，首先 yōu xiān，shǒu xiān
TC 優先，首先
TC 優先，首先
SC 首要 shǒu yào
TC 首要
TC 首要
Firstly you need to write your essay and then you need to edit it.
首先你需要写好你的论文，然后你需要排版编辑。