It takes an emergency vehicle an average of 15 seconds to go one block in the N-S direction and 20 seconds in the E-W direction.
应急车辆驶过一条南北向的街道平均要花15秒，而通过一条东西向的街道平均要花20秒。
It takes an emergency vehicle an average of 15 seconds to go one block in the N-S direction and 20 seconds in the E-W direction.
应急车辆驶过一条南北向的街道平均要花15秒，而通过一条东西向的街道平均要花20秒。
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