These ponderings attempt to let themselves be appropriated by the event. (Beiträge zur Philosophie (Vom Ereignis), Martin Heidegger, 1936–38/1989)
https://www.trisp.org/2016/04/29/using-forward-and-trailing-edge-perspectives-in-working-with-dyads/
前緣 forward edge
後緣 trailing edge