Sentence examples for has never contaminated from inspiring English sources
For decades, oil and gas industry executives as well as regulators have maintained that a drilling technique known as hydraulic fracturing, or fracking, that is used for most natural gas wells has never contaminated underground drinking water.
The natural gas industry insists fracking has never contaminated groundwater.
US transmission of cysticercosis linked to contaminated food products has never been documented, and the small number of reported cases of autochthonous cysticercosis may indicate that the risk is low.
Lake Vostok, a Lake Ontario-size body trapped far beneath the ice on Antarctica, has never been explored for fear of contaminating the ancient ecosystem.
Some scientists who have studied the issue believe that the Energy Department has never really tried to learn much about the contaminated ground water in order to keep public pressure off the agency.
- never had this option and it has never been considered.
Daptomycin has never been used.
Yet this has never been demonstrated.
This assumption has never been investigated experimentally.
However, this has never systematically been examined.
