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.
广东省中医院党委书记史俏蓉介绍，“师带徒”是中医药人才培养的重要方式。自2001年起，广东省中医院率先开启师承全国名老中医的新举措，创造了“跨地区拜师”“集体带、带集体”“一代带二代”“脱产跟师”等模式。至今共有205名“师带徒”指导老师，其中国医大师47名、全国名中医25名。
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2月13日傍晚，在上海科技馆附近，我们乘坐一辆无人驾驶的出租车。南方周末记者 黄思卓/摄
Where quadtrees appear
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