jì / rán / lǎo / bǎn / yǐ / jīng / kāi / le / jīn / kǒu / zhè / jiàn / shì / jiù / méi / yǒu / gǎi / biàn / de / yú / dì / le

既然老板已经开了金口，这件事就没有改变的余地了。

Since the boss has already given his word, there is no room to change the matter.