But how can it be launched quickly on a stormy night at low tide when the sea has retreated down a steep bank of shingle and out across several kilometres of boggy sand?
但是在一个暴风雨之夜，如何能在海潮退于海堤之下的时候还能穿越几公里的沼泽沙地区到海中救人呢？
2
Their boat went aground on a sandbank.
他们的船撞上了水下沙洲搁了浅。
3
They haven't grasped that this is an island, not a sandbank.