I call it a secret war for two reasons.

我把它称之为秘密战争有两个原因。

youdao

I was keen to read more, but was surprised to find that Oman's appendix, published in 1914, was the only considered thing that had been written about this secret war.

我渴望阅读更多（相关史料），但惊讶地发现，奥曼出版于1914年的附录是记载这场秘密战争的唯一值得研究的材料。

youdao

It is now certain there will be increasing global turbulence heading into the autumn as this secret war intensifies.

现在，在今秋，随着这两方秘密的斗争的加剧，全球将会持续升温的动荡。

youdao

In nineteen seventy-one, The New York Times newspaper started publishing secret government documents about American involvement in the Vietnam War.

VOA: special.2009.04.26

The War Department wanted to keep the operation secret.

VOA: special.2009.07.23

They were on their way to attend a memorial service to commemorate the murder of some 22,000 Polish military officers and civilians who were massacred by the Soviet Union's secret police during World War II.

VOA: standard.2010.04.12

Mr. Persico is the author, most recently, of "Roosevelt's Secret War: FDR and World War II Espionage" (Random House, 2001).

CENTERFORSECURITYPOLICY: Center For Security Policy

He said he knew that his father worked on secret projects during the war but had no sense until much later of how important it had been.

BBC: Wartime diary helps to tell Colossus story

"Some activities of American prisoners of war within German prison camps must remain secret not only for the duration of the war against the present enemies of the United States but in peace-time as well, " the document says.

CNN: Lawmakers to Army chief: Honor soldiers held as slaves by Nazis