儿子:Dad, it's Arbor Day today. 爸爸,今天是植树节呢。

　　爸爸:Do you know why Arbor Day is on March 12th? 知道为什么植树节定在三月十二号吗?

　　儿子:Yes, I do. Sun Yat-Sen died on March 12th, 1925. So the Arbor Day was fixed for this day in memory of him.我知道。孙中山先生是一九二五年三月十二号逝世的，为了纪念他，所以把植树节定在了这一天。

　　爸爸:You're right. And this is a good time to plant trees across the whole country.没错。而且这一天对全国来说也是非常适合植树的。