正在准备申请，因为一直被公司派到中国工作，所以现在5年中差不多刚刚好2年半在美国（而且还是在5年中的前两年大多数在美国，后三年，大多数在中国）
问题是这个两年半的条件是要在面试的时候也满足吗？这个问题我自己做的研究，但是没有确切的答案。
From this:
"No person, except as otherwise provided in this title, shall be
naturalized, unless such applicant, (1) immediately preceding the date
of filing his application for naturalization has resided continuously,
after being lawfully admitted for permanent residence, within the
United States for at least five years and during the five years
immediately preceding the date of filing his application has been
physically present therein for periods totaling at least half of that
time, and who has resided within the State or within the district of
the Service in the United States in which the applicant filed the
application for at least three months, (2) has resided continuously
within the United States from the date of the application up to the
time of admission to citizenship, (3) during all the periods referred
to in this subsection has been and still is a person of good moral
character, attached to the principles of the Constitution of the
United States, and well disposed to the good order and happiness of
the United States."
好像不用的，只要申请后保持6个月回去一次就可以了
From http://library.findlaw.com/1999/Jan/1/127117.html
好像是另外一种说法
这里有哪位有具体经验，有哪位律师是对这个领域是特别有研究的？想委托办理让我可以在美国的时间尽量少。