Music of or associated with a trumpet, horn, etc, with no valves or keys, on which only notes of the harmonic series of the keynote might be attained The natural numbers variety a set, commonly symbolized to be a bold N or blackboard Daring ⁠ N displaystyle mathbb N 関さんの森、という言葉の響きが少し面白く感じてしまったので、次の休みにさっそく行ってきました。 https://justpaste.it/esxyw