最重要的是，他们知道如何用脑。

Above all, they knew how to use their brain.

youdao

最重要的是，他们知道如何用脑和独立思考。

Above all, they knew how to use their brains and thought independently.

youdao

最重要的是，他们知道如何用脑和独立思考。

Above all, they knew how to use their brains and thought independently.

youdao