These ponderings attempt to let themselves be appropriated by the event. (Beiträge zur Philosophie (Vom Ereignis), Martin Heidegger, 1936–38/1989)
各向同性（isotropy)
https://zh.wikipedia.org/wiki/%E5%90%84%E5%90%91%E5%90%8C%E6%80%A7
各向異性（Anisotropy)
https://zh.wikipedia.org/zh-tw/%E5%90%84%E5%90%91%E5%BC%82%E6%80%A7
https://en.wikipedia.org/wiki/Anisotropy