Definition
used to indicate acceptance of an unavoidable or unchangeable situation
既然如此，遂接受之。
If they decide to cancel the meeting, so be it, we will reschedule.
如果他們決定取消會議，那就這樣吧，我們會重新安排。
She knew she might not be chosen, but if that is the case, so be it.
她知道她可能不會被選中，但如果真是這樣，那就這樣吧。
I was hoping for better weather, but since it's raining, so be it, we will do something indoors.
我原本希望天氣會更好，但既然下雨了，那就這樣吧，我們會在室內做點什麼。