九十年代初，科学家开始开发新的技术，在不损害环境的基础上增加农业产量。
It was from the early 1990s that scientists started to developed new techniques to increase agricultural production without harming the environment.
九十年代初，科学家开始开发新的技术，在不损害环境的基础上增加农业产量。
It was from the early 1990s that scientists started to developed new techniques to increase agricultural production without harming the environment.
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