Bulky items must be shipped in during the brief period when the sea is free of ice.
大量的物资也必须乘着短暂的海洋无冰期运送进去。
When this nitrogen reaches the sea it causes a brief frenzy of algal growth which depletes the water of oxygen.
当这些氮到达了海洋时，就会引起海洋藻类生物在短时间内疯狂生长，就会耗进水里的氧气。
They have spent several six-month spells at sea, returning home for brief visits.
他们在海上游玩六个月，再回家短暂休整。 这样做已经有好几次了。
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