首先 + Clause
The adverb 首先 (shǒuxiān) means 'firstly,' 'first of all,' or 'in the first place,' used to introduce the first point in a series of arguments or steps. It is placed at the beginning of a sentence or clause and is often followed by 其次 (secondly) or 然后 (then). It is common in both spoken and written Chinese.
首先,我想感谢大家的支持。
shǒuxiān, wǒ xiǎng gǎnxiè dàjiā de zhīchí.
First of all, I'd like to thank everyone for their support.
做这道菜首先要准备好所有材料。
zuò zhè dào cài shǒuxiān yào zhǔnbèi hǎo suǒyǒu cáiliào.
To make this dish, first prepare all the ingredients.
首先我们需要弄清楚问题出在哪里。
shǒuxiān wǒmen xūyào nòng qīngchu wèntí chū zài nǎlǐ.
First, we need to figure out where the problem lies.