答：科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。虽然它们都会引起肝病，但在重要方面又有所不同。
A: Scientists have identified five unique hepatitis viruses, identified by the letters a, b, c, d, and E. While all cause liver disease, they vary in important ways.
科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。 虽然它们都会引起肝病，但在重要方面又有所不同。
Scientists have identified five unique hepatitis viruses, identified by the letters A, B, C, D, and E. While all cause liver disease, they vary in important ways.
它发挥保护作用的可能机制，主要通过异丙酚对氧自由基、钙离子的调节、细胞因子、细胞凋亡和线粒体等几方面的作用来实现。
The propofol play its role through many possible mechanism such as the modulation of oxygen free radical and calcium, cell apoptosis, and mitochondrion.
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