返美證是遞交485時一起遞交嗎？

I－131 表有一個Note：

If you are in the United States and wish to travel abroad, you do not need to apply for advance parol if both conditions described below in number 1 and 2 are met:
1. You are in one of the following nonimmigrant categories:
a. An H-1, temporary worker, or H-4, spouse or child of an H-1; or
b....
2. A form I-485, Application to register Permanebt Residence or Adjust Status, was filed on your behalf and is pending with the USCIS.

However, upon returning to the United States, you must present your valid H, L, K or V nonimmigrant visa and continue to remain eligible for that status.

仔細讀了131的說明，好像是專門給綠卡持有人打算在美國以外呆一年以上時用的。

哪位大俠給大家一個解釋，看同胞們能否省幾百刀。
多謝