【PTE学术干货】最新高频Retell lecture精析 （十三：New rice）
In 1943, what became known as the green revolution began when Mexico, unable to feed its growing population, shouted for help. Within a few years, the Ford and Rockefeller foundations founded the international rice research institute in Asia. And by 1962, a new string of rice called IR8 was feeding people all over the world. IR8 was the first really big modified crop to make a real impact on world hunger. In 1962, the technology did not get exist to directly manipulate the genes of plants. And so IR8 was created by carefully crossing existing varieties, selecting the best from each generation, further modifying them and finally finding the best. Here is the power of modified crops: IR8 with no fertilizer, straight out of the box, produced five times the yield of traditional rice varieties. In optimal condition, with nitrogen, it produced 10 times the yield of traditional varieties. By 1980, IR36 resisted pasts and grow fast enough to allow two crops a year instead of just one, doubling the yield. And by 1990, using more advanced genetically manipulation techniques, IR72 was outperforming even IR36. The green revolution saw worldwide crop yield explode from 1960 through 2000s.
Green revolution 绿色革命，环保革命
Growing population 人口增长
Shout for help 呼救
New string of新的（特指医学、农业等）
Make a impact on 造成影响
Optimal condition 最优环境／条件
The speaker mainly talked about the genetically modified rice and its development.
The speaker mentioned the green revolution in Mexico and world hunger have contributed to the development of genetically modified rice. By 1962, a new string of rice called IR8 appeared. IR8 was created by crossing existing varieties and could produce 5 times more than traditional rice without any fertilizer and 10 times with nitrogen.
Then, the speaker talked about TR36 which appeared in the 1980s, it enables two crops a year instead of just one. As the techniques improve over the year, in 1990s, IR72 was even outperforming IR36.
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