对我们年轻人来说，掌握一门外语是必要的。
对我们年轻人来说，学习英语并掌握它是重要的。
It is important for us young people to learn English and master it.
理解老人对“我们”这些年轻人来说很重要。
It's important for "us" young people to understand the old people.
理解老人对“我们”这些年轻人来说很重要。
It's important for "us" young people to understand the old people.
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