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.
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。
2
This month, researchers aboard the U.S. icebreaking ship Nathaniel B. Palmer are cruising in the Ross sea in search of the signatures of this current system.
研究人员于本月登上了正在罗斯海巡航的美国破冰船纳撒尼尔·b·帕尔默号，寻找这类洋流系统的特征。
3
This month, researchers aboard the U. S. icebreaking ship Nathaniel B. Palmer are cruising in the Ross Sea in search of the signatures of this current system.