非常謝謝你的詳細的解答。我兒子的CASE目前正在等待排期當中。是否轉到了國際簽證中心沒有,我也不知道,也許還沒有吧。我會按照您說的給移民局先寫信。再次感謝您的幫助!
-Unless you receive a letter from USCIS that your I-130 case has been approved and transferred to NVC, your I-130 will still be in USCIS. So, send your letter to USCIS address indicated in your I-130 filing receipt.