His ungloved hands shivering and his body aching from three sleep-deprived days and nights of work in the field, Urmson stares glumly at the machine and weighs his options.

• 厄姆森未戴手套的双手颤抖著，他已在野外工作了三天三夜，由于睡眠不足而全身腰痠背痛。