If the ice is bigger than it can break, the ship can take more run ups and ram the packed ice at full power.
如果冰块大于其破裂能力，船可以进行更多的加速并以全功率撞击浮冰。
Packed ice
原声例句
奇趣工程百科
英语百科
Drift ice
（重定向自Packed ice）
Drift ice is any sea ice other than fast ice, the latter being attached ("fastened") to the shoreline or other fixed objects (shoals, grounded icebergs, etc.). Drift ice is carried along by winds and sea currents, hence its name. When drift ice is driven together into a large single mass (>70% coverage), it is called pack ice. Wind and currents can pile up that ice to form ridges up to several metres in height. These represent a challenge for icebreakers and offshore structures operating in cold oceans and seas.
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