It is not even clear if there exists such a sharp transition.

人们甚至不清楚到底是不是存在这样一个截然分明的转变界限。

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When a vehicle passes a sharp curve, it may overtake if traffic is light.

急转弯路段时，在车辆较少的情况下可以超车。

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When a vehicle passes a sharp curve, it may overtake if traffic is light.

急转弯路段时，在车辆较少的情况下可以超车。

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