如果美国再次试图展开正式谈判（本着真诚接触的意愿提出可信的建议 ） ， 却在再次遭到拒绝后什么也不做，则必将切实暴露其纸老虎的真实面目。
If the US gives negotiations one more serious try (a credible offer and a genuine willingness to engage), gets rebuffed, and then does nothing, it will effectively declare itself a paper tiger.