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人与社会——自然科学研究之伟大成就
背景导入：袁隆平是我国研究与发展杂交水稻的开创者，也是世界上第一个成功利用水稻杂种优势的科学家，被誉为“杂交水稻之父”。几十年来，他不仅解决了中国十几亿人口的吃饭问题，保证了国家粮食安全，还为世界粮食供给作出了杰出贡献。
The third generation hybrid rice (第三代杂交水稻)
The final yield① of the tested variety, G3-1S/P19, came to 1，046.3kg per mu (about 667 square meters), based on two plots of land in Qingzhu Village under the city of Hengyang in central China's Hunan Province.
Experts agreed that the rice has a stout stem (茎秆粗壮), fertilizer tolerance②， lodging resistance③， large spike and more grains.
Unlike the previous④ two generations that required a large amount of water and fertilizers as well as demanding growing conditions and technological support, the third-generation hybrid rice is easier to be cultivated⑤ by ordinary farmers.
One of the most important characteristics⑥ of the third-generation hybrid rice is that it has a shorter growing period. Some previous high-yielding⑦ hybrid rice varieties in China took 160 to even 180 days from sowing⑧ to harvesting, while the figure was shortened⑨ to around 125 days for the new variety.
A shorter growth period can reduce the use of pesticides (农药) and fertilizers, thus reducing cost and improving production efficiency⑩.
China now feeds around 20 percent of the world's population with less than 9 percent of the world's arable land (耕地)．
Yuan Longping, who developed the world's first hybrid rice in the 1970s, has set multiple (混合的) world records in hybrid rice yields in previous years, making great contributions to the food security? of China and the world.
Yuan said：“The third-generation hybrid rice has the comprehensive? strength to promote? a greener and more sustainable? development of China's rice production with higher quality and yield.”
