该结合鞣制工艺属一种清洁型的少铬鞣制方法。
微波能是一种清洁型能源，可以对物料进行选择性体加热。
Microwave is a kind of clean energy and can heat the material selectively.
Envirofit国际集团的研究人员发明了一种能够减少燃料和烟雾的清洁型柴炉。
Researchers at Envirofit International have developed a clean-burning cook stove that USES less fuel and reduces smoke.
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