Let's do first thing first.

让我们先做应该先做的事情。

First thing first. You must finish this before you go.

要紧的事得先做，你得在走之前完成此事。

Plan, be methodic, set priorities and do first thing first.

制定好计划，做事要有条理，分清轻重缓急，重要的事要先做！

First thing first, most of the players are tired and want to quit playing.

首先第一件事就是，在大多数的球员都累了，想退出比赛。

But my job is doing foreign trade, so first thing first, I have to make good understand of the product.

那么为了做好自己的外贸工作，首当其冲的是对自己的产品有充分的了解。