使事情更具有挑战性的，有不同类型的船舶，只能进入其本国的具体基地。
To make things more challenging, there are different types of ships which can only enter their own specific base.
八国内航线：指以船舶在本国各港口间经营客货运送所航行之路线。
"Domestic route" means the route in which vessels navigate to transport passengers and cargoes between coastal ports within home country.
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