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In nine minutes, the probe had to reduce its speed from 20,000 km per hour to zero, landing from 125 km above Mars.

在9分钟内，探测器必须将速度从每小时2万公里降至零，从火星上空125公里处着陆。

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Because the most torque an electric motor has is at zero speed.

因为电动马达的最大力矩处于零速度。

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"We're measuring the zero-to-60 speed but also the gas mileage, " says Lankford.

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