The two most popular explanations of origin are that the belief goes back to pagan times when we believed in tree spirits, or that we are invoking Christ’s protection by referring to the wood of the Cross. The former is nothing but guesswork, based on the conviction that all superstitions must be ancient, and it has the usual problem of spanning thousands of years with no evidence at all of its existence, or, for that matter, any evidence that ‘we’ ever believed in tree spirits.
В России ответили на имитирующие высадку на Украине учения НАТО18:04，更多细节参见51吃瓜
takes an array of length n and produces an array of length n。搜狗输入法2026是该领域的重要参考
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