a tall piece of rock sticking out of the sea near the coast, formed by the action of the waves against the rock on the coast

Sea stacks form a dotted-line off the coast. 海蚀柱在海岸外形成了一条虚线。

The Old Man of Stoer is a 200ft sea stack off the west coast of Scotland. “斯托尔老人”是苏格兰西海岸外一座200英尺高的海蚀柱。