A useful picture is a line of footprints. Somebody walked through here and left one mark for each step, so anyone who comes later can follow the marks back to where the walking started. An audit trail is that line of marks made out of records: each entry is one footprint, and the value is in the chain, not in any single print. Where the chain breaks, the path stops.
可以想成地上一排腳印。有人走過這裡，每踏一步就留下一個印子，所以後來的人可以順著印子一路走回起點。audit trail 就是用紀錄做成的那排腳印：每一筆就是一個印子，重點在整串接得起來，而不是單獨哪一個。哪裡斷掉，路就走不下去了。
登入就可以看每一支怎麼連回核心畫面。