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1 ?冰级 但这不表示一般没有冰级(ice class) 的商船可以安全航行。事实上, 如果没有像冰级船那样加厚船壳钢板, 加固船头, 装有特别的加热 设施, 冬天前往这类港口往往会有风...
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Features should include a long range, strong hull (including Ice Class), seaworthiness, large spaces for provisions and fuel, and large tenders. 参选者必须拥有长距离巡航能力、坚固的船体（破冰级）、适航性、有充分的补给和燃油储存能力以及大型的接应艇。 - 2
Ice-class tugboat "Nevskaya Zastava" ("Neva Outpost") was designed and constructed in St. Petersburg. 冰区航行拖船“涅瓦河前哨”是在圣彼得堡设计和建造的。 - 3
Young man, unless you start turning in your assignments on time and pull up your test scores, I have to tell you that you are on thin ice in this class. 小伙子，我得告诉你，你现在在这个班里的学业情况很危险，除非你及时交作业而且提高你测验的分数。
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