catalyst case的用法和樣例：
例句
- Catalyst returning to the reactor may not be completely regenerated because of insufficient time in the regenerator.
因為催化劑在再生器中停留時間不足，故返回反應器的催化劑可能未被完全再生。 - The physical resistance of catalysts plays a major role in catalyst selection and reactor design parameters.
催化劑的物理強度在催化劑選擇和反應器設計參數方面起著重要的作用。
