powdered catalyst

例句：

1. 1.The cake was made from a mixture of flour and sugar, which was then powdered into small crumbs.
   蛋糕是由面粉和糖混合制成的，然后被磨成小颗粒。
2. 2. The powdered coffee is ready to drink straight from the container.
   粉末咖啡可以直接从容器中饮用。
3. 3. The powdered ingredients were mixed together in a bowl until they formed a smooth paste.
   将粉末状成分在碗中混合直到形成光滑的糊状物。