請教大家，父母的綠卡因為在國內呆的時間太長作廢了。現在想給他們重新申請綠卡，這種情況下獲得批準的可能性大嗎？
-Yes. No problem. But they need to abandon the old/invalid green card first, then you can sponsor them a new green card. See this link for how to abandon their green card:
Abandonment of Status (Form I-407) | U.S. Embassy & Consulates in China (usembassy-china.org.cn)
