We use this phrase to talk about something that might be necessary in the future.

我們用這個(gè)短語(yǔ)來(lái)說(shuō)將來(lái)可能需要的情況

(英國(guó)英語(yǔ)中亦作 if needs be)

If need be, I can bring some extra chairs from home so everyone has a place to sit.

如果需要的話，我可以從家里多帶幾把椅子，這樣每個(gè)人就都有地方坐了。

A: Have you finished your speech for the wedding tomorrow?

你準(zhǔn)備好你明天婚禮的發(fā)言了么?

B: No, but I'll work on it all night, if needs be.

沒(méi)有，但是如果需要的話，我今天晚上就通宵弄完它。