d=7 was the sweet spot for early trained models — multiple independent teams converged on this
当然，他们也赌输过，比如 2014 年，iPhone 6 发布，绿联拿下了苹果 MFi 认证，结果反而让自己不上不下了，论价格比不上市面上没有认证的产品，不看价格又比不过其他大牌的品牌力，狠亏一波。
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All of the robovacs I've tested have announced out loud when they're in remote viewing mode. But not all robot vacuums provide that courtesy notification (the DJI Romo, for one, does not).
曾经被视为第二增长曲线的收购品牌，最终没能成为救星，只是维持着不温不火的状态，在市场上日渐式微。
Tony Jolliffe BBC