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今天我们要学的词是 worsen. Worsen 动词，意思是恶化。网络安全专家预计，Cyberattacks will only worsen in 2015 as hackers use more advanced techniques to infiltrate networks. 黑客不断使用更先进的渗透手段，2015年网络攻击会进一步恶化。在最新民调中，53 percent of Americans said race relations had worsened since President Obama took office. 百分之53的受访者认为，奥巴马总统上台后的美国种族关系出现了恶化。 | 
