How many roads must a man walk down
Before you call him a man
How many seas must a white dove sail
Before she sleeps in the sand
How many times must the cannon balls fly
Before they are forever banned
The answer, my friend, is blowing in the wind
The answer is blowing in the wind
欢迎来到我的博客，这里主要分享我在学习过程中碰到的一些有趣的问题，主题广泛，没有限制。