並前往https://edu.mediatagtw.com/article/Ekman+1972+%E5%AE%9A%E7%BE%A9+%E4%BA%86+%E5%85%AD+%E7%A8%AE+%E5%9F%BA%E6%9C%AC+%E6%83%85%E7%B7%92