cause to navigation-obstruction 碍航成因
jet flow navigation obstruction 急流碍航
observation of navigation obstruction [测] [水运] 航行障碍物探测
navigation obstruction ho lock dam 闸坝碍航
sediment accumulation of obstruction navigation 碍航淤积量
obstruction to navigation 船舶自由航行的不必要阻碍
Republic tugs towed the med center to the fringes of the Kaliida Nebula, offering it some protection from surprise enemy incursions by virtue of the nearby navigation obstruction.
共和国拖船把医疗中心拖到了卡利达星云的边缘，这样，附近的航行障碍物就能适当保护医疗中心免遭敌人的突袭。
These improvements to navigation could be made without the risk of obstruction due to sedimentation, as is expected with the dam.
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。
A sandbar is an obstruction to navigation.
沙洲成为航行的阻碍物。
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