1. How many roads must a man walk down

　　before they call him a man?

　　How many seas must a white dove sail

　　before she sleeps in the sand?

　　2. How many times must the cannon-balls fly

　　before they 're forever banned?

　　The answer, my friend, is blowin' in the wind

　　The answer is blowin' in the wind.

　　听歌学英语:

　　1．How many roads must a man walk before you call him a man?

　　一个人要走多少路才能真正称他是一个人？

　　before在此句是连接词，引导一个时间状语从句，意为“在……前”，在翻译时应特别注意。

　　例: I'll do it now before I forget it.

　　我趁着还没有忘记的时候就做吧。

　　before作为连接词，还有“与其……（宁愿……）”之意

　　例: The soldiers would fight to death before they surrendered.

　　战士们宁愿战斗到死，决不投降。

　　2．How many times must the cannon-balls fly before they're forever banned?

　　炮弹要飞行多少次才能永远被禁止？

　　ban: 禁止，取谛；禁止，禁令

　　例: Swimming in this river is banned.

　　此河禁止游泳。

　　The magazine is under a ban.

　　那本杂志禁止持有。