莎士比亞劇作《羅密歐與茱麗葉》中的角色羅密歐在歌樂作品的演唱與詮釋分析―― 以古諾《羅密歐與茱麗葉》和 伯恩斯坦《西城故事》為例 =A study of vocal practices of the character "Romeo" in Shakespeare's "Romeo and Juliet" - using Gounod's "Romeo and Juliet" and Bernstein's "West Side Story"as examples