直到每个都理解了环保的重要性时，世界才能真正地变得清洁起来。
Not until everyone understands the importance of protecting environment will the world be really clean.
将清洁燃料（天然气）的利用与环境结合起来进行研究，是当今世界的前沿科学技术。
Studying the use of the clean fuel (natural gas) with the environment is the nowadays leading technology in the world.
将清洁燃料（天然气）的利用与环境结合起来进行研究，是当今世界的前沿科学技术。
Studying the use of the clean fuel (natural gas) with the environment is the nowadays leading technology in the world.
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