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.
蚊子变得能在许多环境恶劣的地方生存和繁殖下去。要想在对环境不造成严重损害的情况下杀灭蚊子已经变得越来越困难了。
And mosquitoes tend to settle and reproduce in environmentally sensitive areas, making it much more difficult to kill them off without seriously damaging the environment.
该产品因不采用氟利昂作为发泡剂，固溢出的气体对人体和环境均不造成损害，符合国家环保要求。
The product can never use freon as blister and no harmful gas effused to human body and environment, comply with the national requirements of environmental protection.
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