There is no gainsaying it.

及物动词否定，否认；反驳。

There is no gainsaying this fact.

这一事实谁也否认不了。

There is no gainsaying her ability.

她的能力是无可否认的.

There is no gainsaying the fact that brinkmanship is a dangerous game.

不可能否认这样的事实：即战争的边缘政策是一种危险的游戏。