I'll get back to you
We use this expression to say that we need to find some information or do something and will contact the person later.
我們用這個表達來表示我們需要找到一些信息或做某事，稍后會聯系這個人。
其中得back也就表示了是與某人得再次交談，back得原因是因為之前你缺失了某些信息或者時間不足導致你們上次得交流并沒有完成。等你掌握了消息之后，你就會get back to sb. 除此之外也不排除有人會把這句話當作拒絕得委婉表達，當面不給你消息，以后再說。可以翻譯作“稍后我給您回話、再跟你說、回頭跟你說、等……告訴你”。
與以下幾個表達同義：
I'll let you know.
I'll respond to you soon.
As soon as I know the answer, I will tell you.
A: Can you tell me how many students are taking the exam next month?
你能告訴我下個月有多少學生參加考試么?
B: I'll find out. I'll get back to you.
我會查清楚回頭告訴你。
