self.config = config or Config()
已知中国境内家马的出现，大约晚至距今4000年的黄河上游地区，例如属于齐家文化的甘肃永靖大何庄遗址、玉门火烧沟遗址等。而黄河中下游地区出现家马，则更晚至商代晚期的安阳殷墟遗址。
。Line官方版本下载是该领域的重要参考
Must achieve = 99% accuracy on 10,000 random test pairs (held-out, fixed seed)
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eBay announced that it is cutting about 800 jobs from its global staff. "We are taking steps to reinvest across our business and align our structure with our strategic priorities, which will affect certain roles across our workforce," the retailer said in a statement as reported by Bloomberg. This move will see about 6 percent of eBay's current full-time workers laid off. Bloomberg noted that eBay would continue hiring in "key areas" but did not specify what those fields are.