不需要提供任何解释

它说“(see instructions)”。你有没有看instructions？I-131 instructions第10页说：

c. Advance Parole Document for Individuals Who Are Currently in the United States
If you are in the United States, you must attach:
(1) A copy of any document issued to you by USCIS showing your present status, if any, in the United States; and
(2) An explanation or other evidence showing the circumstances that warrant issuance of an Advance Parole
Document; or
(3) If you are an applicant for adjustment of status, a copy of a USCIS receipt as evidence that you filed the
adjustment application; or
[...]

这里“or”的意思就是只需要符合任何一个就行。既然你是Adjustment of Status（I-485）申请者，你附上I-485收据（或者，如果你跟I-485一起递交，就什么都不用附上），就不用提供任何explanation或evidence。