大量的物资也必须乘着短暂的海洋无冰期运送进去。
Bulky items must be shipped in during the brief period when the sea is free of ice.
航行船只局限于小船，即使在短短夏季数月的无冰期，通行起来也足够困难。
Navigation was confined to shallow vessels, tricky enough even in the few summer months when the river was free of ice.
航行船只局限于小船，即使在短短夏季数月的无冰期，通行起来也足够困难。
Navigation was confined to shallow vessels, tricky enough even in the few summer months when the river was free of ice.
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