更清洁的用英语怎么说？

更清洁的

例句

• ...demands for purer and cleaner river water. 需要更纯净、更清洁的河水
• Countries cannot have it both ways: the cost of a cleaner environment may sometimes be fewer jobs in dirty industries... 各国不可能两全其美：环境更清洁的代价有时可能就是污染企业就业岗位的减少。
• Manufacturers are working with new fuels to find one that burns more cleanly than petrol. 制造商们正在研制新型燃料，以找到一种比汽油更清洁的燃料。