我们收到了这份非官方报告，但它没有公司盖章。

We received this ___non-official report, but it doesn't have the company's stamp.

他以非官方的身份参与了这次讨论。

He participated in the discussion as a ___non-official member.

这份非正式报告包含了许多未公开的细节。

The ___non-official report includes many unpublished details.