在大数据时代，发达国家最大的商机就是信息，即我们通过电子邮件，互联网，电视和手机可以获得更多的信息。

Sentence No. 1 Australia has millions of sheep. They say there are three sheep for each inhabitant of the country. Thousands of tons of wool are produced each year in Australia.

Sentence No. 4 In the big-data era, the biggest business in developed countries has become information, which we have more access to, thanks to email, the Internet, TV, and cell-phones.