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You don't know the first thing about farming.

你对耕种一无所知。

《柯林斯英汉双解大词典》

She said the first thing that came into her head.

她想到了什么说什么。

《牛津词典》

But,she later woke up. The first thing she asked for was a pair of scissors so she could start another paper creation.

VOA: special.2010.04.14

And the first thing you do is ask is it an instance of some problem that other people have already solved?

而且你以前从没碰过这个问题,你首先要做的一件事就是问问自己,这是不是一个别人已经解决了的问题？

麻省理工公开课 - 计算机科学及编程导论课程节选

The first thing I have to do is give you understanding of the physics of the gas discharge tube.

首先要做的就是让你们理解,气体放电管的物理学原理。

麻省理工公开课 - 固态化学导论课程节选

The first thing the coalition plans to do is make "dirty" energy more expensive.

BBC: Who pays for UK coalition's 'green economy'?

The first thing Wiens could smell was lasagna at the hospital, which smelled "delicious, " he said.

CNN: Face transplant patient ready to go home

The first thing you want to figure out is what they call the Razer User Interface.

FORBES: Macroing With The Razer DeathStalker Ultimate in Eve