Similarly, a magazine in England found that tap water from the Thames River tasted better than several leading brands of bottled water that were 400 times more expensive.
Tests on leading brands of bottled water turned up a variety of contaminants often found in tap water, according to a study released by an environmental advocacy group.
一项由环保组织公布的研究表明，主流品牌的瓶装水检测出一些在自来水中出现的污染物。
3
Theoretic analysis indicates that the impact effect and stress waves of tap on the workpiece result in extended micro cracks, leading to lower plastic deformation and a much lower tapping torque.