Article 3. The Times for a motor vehicle to pass the border shall be restricted to the period between sunrise and sunset unless otherwise approved by Customs in conjunction with concerned organs.

第三条汽车进出国境的时间，除经海关会同有关机关批准的以外，应当限于日出后和日没前。

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Mercury only has a few good viewing times, before sunrise or shortly after sunset.

BBC: Close up on Mercury