The noun 催化剂 (cuīhuàjì) means "catalyst," a substance that speeds up a chemical reaction without being consumed. It combines 催化 (to catalyze) with 剂 (agent/preparation). It is used in chemistry and also metaphorically to describe anything that accelerates a process.
铂是化学反应中常用的催化剂。
Bó shì huàxué fǎnyìng zhōng chángyòng de cuīhuàjì.
Platinum is a commonly used catalyst in chemical reactions.
这次事件成了两国关系恶化的催化剂。
Zhè cì shìjiàn chéngle liǎng guó guānxì èhuà de cuīhuàjì.
This incident became a catalyst for the deterioration of relations between the two countries.
没有催化剂的话,这个反应会非常慢。
Méiyǒu cuīhuàjì de huà, zhège fǎnyìng huì fēicháng màn.
Without a catalyst, this reaction would be very slow.