伊拉克官员说，在沿海一带有大约80艘堵塞航道的沉船，必须予以清除。
Iraqi officials say there are about 80 shipwrecks littering the coastal area and blocking shipping lanes that need to be removed.
这些航运能力的改进无需冒着因建造大坝而造成淤泥堵塞航道的危险也可以实现。
These improvements to navigation could be made without the risk of obstruction due to sedimentation, as is expected with the dam.
它不仅能够封冻港口、堵塞航道、中断交通运输，而且还能破坏港工设施，撞毁海上过往船只及海上结构物。
Not only can it freeze the port, block the sea channel, break off the transportation, it also can destroy the port installations and crash out ships.
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