pro·ti·um /ˈprotiəm, ˈproʃi-/ 3種氫的同位素質量最輕者
pro·ti·um /ˈprotɪəm, ˈproʃɪ-/ 名詞
Protium n : genus of chiefly tropical American trees having fragrant wood and yielding gum elemi [syn: genus Protium]