卡内基·梅隆大学的机械学家克里斯多佛·厄姆森坐在方向盘后面，但并没有在驾驶。
Christopher Urmson, a Carnegie Mellon University robotics scientist, was behind the wheel but not using it.
来自第四官员李。梅森的视频协助可以给克里斯。福伊有力的建议，这可以改善裁判的表现。
Video assistance from the fourth official, Lee Mason, would almost certainly have given Chris Foy second thoughts about the decision that marred the referee's otherwise impressive performance.
克里斯梅森为此还在洛杉矶图书节上向我道歉。
Chris Metzen apologized for the mix-up at the L. A. Festival of Books.
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