Translation of "Opines" in German

"It's a learning process," opines Wolf-Bauwens.

And now J. Siegerist opines in his essay:

The author then further opines in his article:

On this being pointed out, the author now opines:

These should be mustered with foreign support", opines Rafik Schami

Tshitenge Lubabu in Burundi opines that the roots of the crisis are the current political leaders:

W3Lanka English blog opines:

Gorbachev opines that if elections were free, Russia would have much more opposition.

Or is it no more than a “sacred number”, as Mr Pohl opines in the above passage?

Communication between science and society cannot be a one-way street, opines Carsten Neßhöver.

Or is it no more than a "sacred number", as Mr Pohl opines in the above passage?

Moreover, in light of the introduction of EU citizenship, and the Court's case law in this area, the Advocate General opines that assistance with maintenance costs now falls within the scope of community law.

Advocate General Kokott opines that, as Community law currently stands, the publication of false accounts must be treated as equivalent to a failure to publish accounts.

However, Advocate General Maduro opines that the Asturian legislation is not coherent and consistent in its pursuit of this goal.

The withdrawal of land or buildings from business assets is subject to VAT pursuant to German administrative instructions while the Commission opines that they should be VAT exempt.