九、文化交流
好处：
1、cultural exchanges can enhance international friendship.
2、people can acquire better understanding of each other.
3、can also greatly benefit the countries and stimulate their own social development and culture prosperity.
十、繁荣：
thrive/boom/flourish/blossom
十一、人口问题、解决问题：
1、the awareness of struggling for one”s life is essential to the young man
2、parents i
