We were in grave danger.

我们处于极大的危险之中。

《牛津词典》

It could put my father in grave danger.

这会将我父亲置于非常危险的境地。

youdao

This is a grave danger for all people in all countries.

这对所有国家的所有人民都是一种巨大的危险。

youdao

In the face of great odds and grave danger, they get the job done.

WHITEHOUSE: President Obama Speaks about the Veterans Job Corps

Are they living a world that is in grave danger because of what we've done to its climate?

CNN: Obama's Father's Day speech

Mr Obama and his Democratic colleagues on Capitol Hill are in grave danger of throwing away a rare chance.

ECONOMIST: American health care