在极地冰区中，破冰船利用起尾部的特殊凹槽与被拖船船首相连的拖带方法。
A method of towing vessels through polar ice by means of icebreaking tugs with a special stern notch suited to receive and bow of the vessel to be towed.
为了给货船开路、驶进港口，营口港和辽宁海事局一起行动，派遣拖船破冰。
In order to make way for the cargo ships to sail in, Yingkou Port and Liaoning Maritime Safety Administration are working together - sending in tugboats to break the ice.
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