Pack ice around Iceland was becoming a threat to navigation.
冰岛周围的浮冰一度成为船舶航行的威胁。
Navigation dangerous on area around the North Pole due to pack ice.
由于多积冰，在北极附近水域航行是危险的。
Navigation in area around Snake Island only possible with ice-breaker assistance.
在格林兰岛附近航行的船不用破冰援助只有是这些马力大，船体强度高的船。
Navigation in area around Snake Island only possible with ice-breaker assistance.
在格林兰岛附近航行的船不用破冰援助只有是这些马力大，船体强度高的船。
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