A sandbar is an obstruction to navigation.
沙洲成为航行的阻碍物。
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。
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。
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。
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