Ask high school physics bosses to explain.

As the major emerging market countries in the world, Brazil, Russia, India, China and South Africa account for 27% of the world's total land area, 4 1% of the world's total population, 15.3% of the world's total GDP, 14.8% of the global trade volume and 38% of the global cultivated land area. The BRICS countries are called "BRIC" because they all have high "gold content". China and Russia are both founding members of the United Nations and permanent members of the Security Council. In 20 10, China's economic aggregate surpassed that of Japan and became the second largest economy in the world.