spiculate spike

例句：

1. 1. The spicules of the coral are used to make jewelry.
   珊瑚的刺被用来制作珠宝。
2. 2.The spicules in the soil help to aerate the soil and improve its fertility.
   土壤中的刺有助于通气和提高土壤的肥力。
3. 3. The spicules on the surface of the shell are used to hold the shell together.
   贝壳表面的刺用于将壳固定在一起。