“河东村那边刚去过，年后还有好几口井要打。”这名打井师傅告诉记者，“最近几年，我打了300多口井，在河东村、大马家沟、虎狼城（村）。”
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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.，推荐阅读下载安装汽水音乐获取更多信息
def check(*args):