Those children need a firm hand to make them behave.

那些孩子得严加管教。

《牛津词典》

The secret is a sharp knife and a firm hand.

诀窍就是得有一把快刀，和一只果断的手。

youdao

Greet your new friend with a firm hand shake!

握手表达对新朋友的欢迎！

youdao

Now, with this in hand, what I want to do is, and in Firm 2 I have a similar expression, what I want to do is, I want to figure out the Nash Equilibrium of this game.

知道它了以后,因为公司2的表达式也是相似的,接下来我们就可以尝试找出纳什均衡了

耶鲁公开课 - 博弈论课程节选

Holding it all together across diverse industries and countries, however, will take a firm hand.

ECONOMIST: Tata seeks a chairman

It is hoping those, and a firm hand when it comes to security, will end the tensions.

BBC: Who is fanning Tibet's flames?

Sometimes a firm hand is needed for diplomacy to work in the defence of democracy and liberties.

ECONOMIST: Letters