第1个回答 2013-08-02
学生们逐渐认识到，需要多年的时间才能掌握一门外语
The students gradually realize that they need many years to master a foreign language
第2个回答 2013-08-02
Students come to realize that only when they spend many years in learning English can they have a good command of it .
第3个回答 2013-08-02
Students are gradually realizing that it will take so long to manage a foreign language.
第4个回答 2013-08-02
Students come to realize that, it takes years to master a foreign language