180 天是個 threashold 之類的底線。如果非法居留，或非法打工沒到 180 天，就認為問題不嚴重，可以忽略。超過了就開始懲罰。
為啥485之前出國簽個證就沒事兒了呢？
因為移民局審查身份曆史的時候，隻是從最近一次你用非移民身份進美國開始。所以再簽一次 h 簽證，入關一次，移民局就不會查以前的記錄樂。
相關法律如下，這段的上下文就是說什麽樣的人可以經過 adjustment of status (485）而不必到境外簽證拿到綠卡。
section 245(k):
(1) the alien, on the date of the filing an application for adjustment of status, is present in the United States pursuant to a lawful admission
(2) the alien, subsequent to such lawful admission has not, for an aggregate period exceeding 180 days -
(A) failed to maintain, continuously, a lawful status;
(B) engaged in unauthorized employment; or
(C) otherwise violated the terms and conditions of the alien's admission
為啥485之前出國簽個證就沒事兒了呢？
因為移民局審查身份曆史的時候，隻是從最近一次你用非移民身份進美國開始。所以再簽一次 h 簽證，入關一次，移民局就不會查以前的記錄樂。
相關法律如下，這段的上下文就是說什麽樣的人可以經過 adjustment of status (485）而不必到境外簽證拿到綠卡。
section 245(k):
(1) the alien, on the date of the filing an application for adjustment of status, is present in the United States pursuant to a lawful admission
(2) the alien, subsequent to such lawful admission has not, for an aggregate period exceeding 180 days -
(A) failed to maintain, continuously, a lawful status;
(B) engaged in unauthorized employment; or
(C) otherwise violated the terms and conditions of the alien's admission
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