Counterfactuals Causal inference is easier when the effects are large and sudden. The COVID-19 pandemic and accompanying policy measures caused economic disruption so stark that sophisticated statistical approaches were unnecessary for many questions. For example, unemployment jumped sharply in the early weeks of the pandemic, leaving little room for alternative explanations.
宜昌古称夷陵，因“水至此而夷，山至此而陵”得名，后取“宜于昌盛”之意改称宜昌。宜昌历史悠久，七八千年前先民就在这块土地上繁衍生息。宜昌也是蜡梅原产地之一，每逢冬春，宜昌市夷陵区的野梅谷河谷灿黄、花密如星。这朵指尖大小的花卉，耐受住第四纪冰川的考验，经历数百万年地质变迁，至今仍保持着旺盛的生命力。
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