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。
But even if the ice melts as fast as shippers hope (and scientists fear), navigation is likely to demand strengthened hulls, higher insurance and extra training for crews, all adding to the costs.
但是即使冰融化得象航运者们希望的那样快(科学家们担心的)，航行可能需要加固船体、更高的保险和对全体船员附加的训练，所有的都增加了开销。
Navigation dangerous in area around fairway due to floating ice.
由于浮冰，在航道附近航行危险。
His navigation of the Bering Sea was 21 halted by the 22 impassible Arctic ice.
他在白令海的航行因无法穿越北极冰块而止步。
Ice dam, ice cover and ice jam, which are formed by stack, jammed and collective ice, can increase river resistance and water stage, resulting in flood, construction damage and navigation problems.
冰块堆积，堵塞和聚集形成的冰坝、冰盖和冰塞会导致河道阻力增加，致使上游水位上涨，并可能造成冰期洪水，建筑物破坏，航运不畅等危害。
Ice dam, ice cover and ice jam, which are formed by stack, jammed and collective ice, can increase river resistance and water stage, resulting in flood, construction damage and navigation problems.
冰块堆积，堵塞和聚集形成的冰坝、冰盖和冰塞会导致河道阻力增加，致使上游水位上涨，并可能造成冰期洪水，建筑物破坏，航运不畅等危害。
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