当医学研究人员了解了如何预防疾病并阻止其传播时，全世界许多人的生活质量得到了改善。
When medical researchers learned how to prevent diseases and stop them from spreading, the quality of life for many people around the world improved.
研究人员下决心要弄清楚禽流感在全球范围内是如何在人与人之间传播的。
Researchers have been determined to figure out how bird flu spreads from human to human worldwide.
至少有一个病例中，医院工作人员在恐慌中离开了工作场所，从而阻止了可能传播不洁疾病的注射，但埃博拉病毒并没有消失。
Hospital workers in at least one case deserted their workplace in panic, thus halting the administering of potentially unclean disease spreading injections, but Ebola has not disappeared.
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