We use this phrase to talk about something that might be necessary in the future.
我们用这个短语来说将来可能需要的情况
(英国英语中亦作 if needs be)
If need be, I can bring some extra chairs from home so everyone has a place to sit.
如果需要的话，我可以从家里多带几把椅子，这样每个人就都有地方坐了。
A: Have you finished your speech for the wedding tomorrow?
你准备好你明天婚礼的发言了么?
B: No, but I'll work on it all night, if needs be.
没有，但是如果需要的话，我今天晚上就通宵弄完它。
