first things first
US /fɜrst θɪŋz fɜrst/
UK /fɜrst θɪŋz fɜrst/

1.
首先, 當務之急
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,我們先制定一個計畫。
•
Before we discuss the details, first things first, we need to agree on the main goal.
在我們討論細節之前,首先,我們需要就主要目標達成一致。