英语句子语法错误,谁能帮忙改正,

题目

英语句子语法错误,谁能帮忙改正,
Obviously,these students can increase their knowledge and broaden their vision when they reach their third and fourth years

答案

显然,当这些学生到第三和第四年的时候,就能增加知识和开阔视野.