Studying a foreign language involves the same steps as those taken in learning a mother tongue, but the process is more complex.
所謂「外語」，就是外國話。外語的學習歷程是否與母語相同？目前可以證實的是，學習外語和學習母語一樣，有相同的發展順序，但它還牽涉到更多、更複雜的問題。