By now, it's firmly established that modern humans and their Neanderthal relatives met and mated as our ancestors expanded out of Africa, resulting in a substantial amount of Neanderthal DNA scattered throughout our genome. Less widely recognized is that some of the Neanderthal genomes we've seen have pieces of modern human DNA as well.
“赶上下大雪，我们的工作会相对轻松些，但天然雪并不能完全代替人工造雪。”他解释其中缘由，“造出来的雪湿度大，颗粒也就很大，这样才能用压雪机压实，雪友们滑起来更舒适。天然雪湿度小，颗粒也小，像面粉一样散，坡度稍微平些的地方根本滑不动。”
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