low-tide line

This afternoon, the water off the New College of Florida campus was shallow enough at low tide that McClure could easily walk 100 yards offshore and cast his line in any direction.

这天下午，佛罗里达学院新校区附近的浅海滩，海水还很浅。马克留尔很轻松地涉水来到距岸边100码左右的地方，在这里他可以朝任何方向抛杆下钓。

Draw a sketch map of the bay indicating its landscape, aspect, approximate positions of the high tide mark and low tide mark and position of the transect line.

绘画一张研究范围的简图，图中应包括地形、样条的位置和方向、高潮线和低潮线位置等有关因素。