Sit tight. I'll be right back.

别慌张，我马上回来。

《柯林斯英汉双解大词典》

I'll be right back.

我马上就回来。

《牛津词典》

I'm going to get some water. I'll be right back.

我去拿些水，马上就回来。

《柯林斯英汉双解大词典》

Hey. I'll be right back.

VOA: standard.other

I'll be right back.

我马上就回来。

I will 课堂 - SpeakingMax英语口语达人

I'll be right herewhen you get back.

VOA: standard.other

Please send me an email and let me know if you'd be interested in this upgrade and I'll get back to you right away with the details.

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