词汇讲解：
1. epidemic n. 流行病
例句：The Sanitary Board tries to stamp out the epidemic.
卫生局试图消灭这种流行病。
2. highlight vt. 强调, 突出, 使显著
例句：The President highlights the importance of his visit to China.
总统强调访问中国的重要性。
3. hypothesis n. 假说, 假设, 前提
例句：The theory is based on the hypothesis that all men are born equal.
这个理论基于人人平等的前提。
4. compelling adj. 引人入胜的;扣人心弦的
例句：She found his story so compelling that she had forgotten
