Utilizing the acoustic wave's characteristics, we can detect the interior structure and quality of the anchor system and, judge the anchorage state by beating the anchor bar's top with a hammer.

利用振动波传播具有的许多独特性质，可以在锚杆表面人工激发应力波来探测锚杆体系内部的结构和性质，以此来判断锚杆的锚固状态。

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Anchor coral, also called hammer coral, have anchor-shaped ends to their tentacles.

铁锚珊瑚，也称榔头珊瑚，有铁锚—形状末端到它们的触须。

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