n.课堂作业，课间自修
Fleeing disaster or insuring the safety of a ship, aircraft, seawall or other major structure.
一为紧急避难或确保船舶 、 航空器 、 海堤或其他重大工程设施安全者.
The storm has considerably weakened the seawall.
风暴严重地损坏了海堤.
The waves lick at the seawall.
波浪轻轻地拍打海堤.
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