reference substance的用法和樣例：
例句
- Simulation is no longer that of a territory, a referential being, or a substance.
而所謂模擬，也不再僅僅是指對某個領域的模擬，對某個參照物或者某個實體的模擬。 - In a world of moral fluidity, Tiananmen is an anchor, a gratifyingly fixed reference for our judgments of others.
在這個道義善變的世界，天安門事件成為一根標杆，是我們評價他人時一個令人滿意的固定參照物。
