catalyst 是可數名詞嗎
catalyst 英 ['k?t(?)l?st] 美 ['k?t?l?st]
n. [物化] 催化劑；刺激因素
是可數名詞，其復數形式為：catalysts
例句：They are lured by their patriotism, their desire to serve as catalysts for change and their beliefthat the Chinese government will back them. 是出於愛國心， 期望自身能作為國家變革的催化劑，也是出於對政府支持的信任， 這些海外科學家回來了。