harmlessness造句怎么写

At present, the trench of development on the research of flocculant are chiefly: the high efficiency, low consumption, safety, no harmlessness and no two-time pollution.

Treated sludge basically realized the harmlessness, reduction, the environment will not cause secondary pollution.

And the last one, being an ecological economy, favors an environmental harmony, featuring the saving and cycling of resources, and, in practice, the carrying-out of reduction, resourcefulness and harmlessness.