We need to keep a firm grip on the situation.

我们需要牢牢地掌握局面。

The home team took a firm grip on the game.

主队牢牢控制着比赛的局面。

With a firm grip on my hand, he pulled me away.

他紧握我的手把我拉开。

He kept a firm grip on his children.

这孩子紧紧地抓住汤姆不放。

The other is the firm grip such bourses have on their own products.

另一个是此类交易所在自有产品上所有的公司控制力。