軌道 軌跡 Users often narrate their trajectory from fear to enthusiasm. ユーザーは不安から熱狂に至る軌跡を語ることが多い。 The path followed by a moving object; a course of development. tra（通る）＋ject（投げる）→ 投げた物の通る道＝軌道 path arc
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
