Of course some countries want to do everything at once, just like the US negotiated with Singapore for three years. Also, the US and South Korea have been talking about a free trade agreement for a good many years, but still the US Congress has not ratified it, and it may be stuck on just one or two things.
當然，有些國家會希望一次談出來，像美國跟新加坡談了 3 年；美國和韓國也談了好幾年，到現在美國國會還沒有通過「美韓自由貿易協定」，可能就是被一、兩樣東西卡住了。