There is a big difference between learning a language in order to understand or to say something if needed, and wanting to acquire a second language in order to command it freely, almost like you command your first language, your mother tongue.
学习一门语言是为了理解或在需要时说些什么,而想要学习第二语言是为了自由地指挥它,这与你指挥你的第一语言,你的母语有很大区别。