After months of cuts, management concluded that the remaining costs were irreducible without closing a branch.

經過數月刪減後，管理階層認為若不關閉分行，剩下的成本已無法再降低。

The shipping delays reflect an irreducible minimum of customs processing time at the port.

運送延誤反映出港口海關作業時間有其無法再壓縮的最低限度。

Our travel budget is now irreducible, so any new trips need the director's approval.

我們的差旅預算已經無法再刪減，因此任何新的出差都需經過主管核准。