英文を訳して下さい。
Hall passed the telegram to the Foreign Office on 5 February, but still warned against releasing it. Meanwhile, the British discussed possible cover stories: to explain to the Americans how they got the ciphertext of the telegram without admitting to the cable snooping; and to explain how they got the cleartext of the telegram without letting the Germans know their codes were broken. Furthermore, the British needed to find a way to convince the Americans the message was not a forgery.
For the first story, the British obtained the ciphertext of the telegram from the Mexican commercial telegraph office. The British knew that the German Embassy in Washington would relay the message by commercial telegraph, so the Mexican telegraph office would have the ciphertext.
