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MX  门槛=20%  门=cost>80  步长 up=0.3 down=0.3  条数=4
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20230610_ManalPromotion / Slot car race set词组
  kw    pista carros electrica          0.48 → 0.53    up    acos=14.2%   cost=297.71   clicks=76
  kw    autopista electrica             8.40 → 8.70    up    acos=16.1%   cost=265.78   clicks=91

SP Campaign Recommendation - Suggested Products - 03/30/2022 a70a69 / AGM MASTECH - Slot Cars/Racing
  kw    agm                            16.40 → 14.00   down  acos=72.9%   cost=1786.95  clicks=1037

20230610_ManalPromotion / Slot car race set精准
  kw    agm                             0.30 → 0.21    down  acos=inf     cost=91.10    clicks=134

[MX] 过暗闸拦截 1 条（bid 已低于自均 CPC 的 1/3，再降也拿不到量，停止降价）：
  kw    agm mastech                  bid=0.5    自均CPC=2.687   比值=1/5.4  acos=inf     SP Campaign Recommendation / AGM MASTECH