我在《文明之光》中写到了曼哈顿计划和美国投下的两颗原子弹，这促使了日本投降。现在很多档案解密了，其中有一条很有意思，链接如下（不知是否需要翻墙）。如果当时日本没有投降怎么办？当时美国根本也没指望说话可能不算数的苏联出兵，而是每个月为日本准备了三颗原子弹。根据这篇解密档案介绍，美国还有七颗没投，原计划是八月再投一颗，9，10月各三颗。原文如下

Groves expected to have another atomic bomb ready for use on 19 August, with three more in September and a further three in October.[274] Two more Fat Man assemblies were readied. The third core was scheduled to leave Kirtland Field for Tinian on 12 August.[273] Robert Bacher was packaging it at the Ice House at Los Alamos when he received word that the Japanese had initiated surrender negotiations.[275] Groves ordered the shipments suspended. On 11 August, he phoned Warren with orders to organize a survey team to report on the damage and radioactivity at Hiroshima and Nagasaki. A party equipped with portable Geiger counters arrived in Hiroshima on 8 September headed by Farrell and Warren, with Japanese Rear Admiral Masao Tsuzuki, who acted as a translator. They remained in Hiroshima until 14 September and then surveyed Nagasaki from 19 September to 8 October.[276] This and other scientific missions to Japan would provide valuable scientific and historical data.

https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/books-and-monographs/the-final-months-of-the-war-with-japan-signals-intelligence-u-s-invasion-planning-and-the-a-bomb-decision/csi9810001.html