spike

n. 长钉,钉鞋
v. 以大钉钉牢,使...失效

There are many sharp spikes on the railings in the park.

公园的栏杆上有很多尖头。

A pointed tool, such as a spike or chisel, used for breaking rock or ore.

钢楔一种如尖铁或凿子等有尖的，用于劈裂岩石或砂石的工具