They also found that when people spent more time looking at the natural scene their heart rates tended to decrease more. That was not the case with the plasma screen.
他们发现当人们将目光更多转向自然风光的时候，他们的心跳趋缓，而看高清屏幕的时候却没有这种现象。
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The blood is also made up of plasma. Plasma is mostly water. It also has some vitamins, minerals, proteins, hormones and other natural chemicals.