近四十年来，中国发生了巨大的变化．
Great changes have in China in the past forty years．
在大学毕业之后，我们终于有机会出国旅游了．
After university， we finally got the chance to travel abroad．
中国母亲河长江，是世界第三长河．
The Yangtze River， the mother river of China， is the river in the world．
我将亲手制作卡片，感谢母亲为我所做的一切．
I'll make a card myself to be my mother for what she has done for me．
令人惊讶的是，一些科学发现是偶然发现的．
Surprisingly， some scientific discoveries were made ．