尽管由于爱因斯坦的上书,美国的核研究工作得到了政府的支持,科学家们的积极性也被调动了起来。但是一来当时美国还没有正式参战,二来本土也没有受到战争的威胁,所以政府对支持核研究的积极性有限,尤其在军界没有受到应有的重视,以致研究工作进展不快,甚至不时中断。 Although thanks to Einstein’s letter, the nuclear research efforts of the United States have received government support, the enthusiasm of scientists has also been mobilized. However, at that time, the United States had not yet entered the war formally. In the meantime, the Mainland was not threatened by the war. Therefore, the government’s enthusiasm for supporting nuclear research was limited. In particular, the military sector did not receive the attention it deserved. As a result, the research progress was unpleasant and even interrupted from time to time .