

Nearly three months after Russia launched its invasion, Western countries appear more committed than ever to Ukraine’s defense, and, in some quarters, to Russia’s defeat. We asked PS commentators what outcome the West, Russia, and Ukrainians themselves can realistically expect.
多伦多—相互指责的把戏开始了。新冠病毒的真正感染人数仍不得而知,但在疫情发展的过程中充斥着仇恨和错误信息。造谣和病毒本身对家庭和社区造成的损害,等同于我们未能确保政策由科学决定的,而非言论。
研究表明,病毒从动物传染给人类更为常见。有人错误地认为疫病是由于人为失误造成的。但有证据表明,生物群落或栖息地的保存与其多样性减少了人类与动物的接触,也减少了人类群体中出现新病原体的可能性。我们对科学的研究不足是导致目前冠状病毒危机的一个主要因素。
由动物传播的疾病比以往任何时候都更为普遍。一项2017年同行评审研究发现,那些感染人类的新发传染病,如西尼罗河病毒、埃博拉病毒、非典和莱姆病,75%是人畜共患疾病,或由动物身上传播的病原体所引起的疾病。
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