first things first

US /fɜrst θɪŋz fɜrst/
UK /fɜrst θɪŋz fɜrst/
"first things first" picture
1.

首先, 当务之急

used to say that the most important thing should be dealt with before anything else

:
Okay, first things first, let's make a plan.
好的,首先,我们先制定一个计划。
Before we discuss the details, first things first, we need to agree on the main goal.
在我们讨论细节之前,首先,我们需要就主要目标达成一致。