take one (thing) at a time

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to do or deal with one thing before starting to do or deal with another

(对问题)一个个来处理

A: I want you to book the tickets, phone a taxi, organise the hotel and plan the meeting.

我想让你订一下机票，叫个出租车，安排酒店并且计划好会议。

B: Ok, but I can only do one thing at a time.

可以，但我只能一个一个做。

Please have the courtesy to have only one person speak at a time, as we all want to have our say.

请尊重发言权，一次只能有一个人发言，我们每个人都希望有机会提出自个儿的意见。