Last February it was too cold for swimming (the pools are supposed to be
heated, but you can't prove that by me).

(元のウェブサイトはこちら)

I've read that the Germans are not a friendly people. But
you can't prove that by me from this visit.

(元のウェブサイトはこちら)

You can't prove that by me

---とよく言われていますが、私の実際の経験ではそうでもない