He and other refugee scientists were worried that Germany was working to develop an atomic bomb.

VOA: special.2009.06.14

The Manhattan Project,when they created the atomic bomb and whether or not you agree with the Manhattan Project normatively.

曼哈顿计划中，他们创造了原子弹,无论你是否同意,这计划。

哈佛公开课 - 幸福课课程节选

In nineteen forty-two, Mister Oppenheimer joined the American government's project to develop the atomic bomb.

VOA: special.2009.06.14

"The world will note that the first atomic bomb was dropped on Hiroshima,a military base.

VOA: special.2011.06.23

He was asked to help Robert Oppenheimer with the atomic bomb test at Alamogordo.

VOA: special.2009.06.14

President Harry Truman announced to the world about the first bomb: "The world will note that the first atomic bomb was dropped on Hiroshima, a military base.

VOA: special.2009.06.14

The goal was to protect workers who were developing the atomic bomb.

VOA: special.2009.07.14

The first atomic bomb has been exploded.

VOA: special.2009.06.14

Uranium enrichment is the process used to make fuel for nuclear power plants, but when extended it can also produce fissile material for an atomic bomb.

VOA: standard.2009.11.28

Seventy-eight-year-old Tomiko Matsumoto survived the atomic bomb.

VOA: standard.2010.08.06