calyx core drill

例句：

1. 1.The calyx is the outer layer of a flower that protects the reproductive parts.
   花萼是一朵花的外层，保护着生殖部分。
2. 2.The calyx is also known as the corolla in botanical terms.
   在植物学中，花萼也被称为唇瓣。
3. 3. The core drill is used to remove the calyx from the fruit.
   核心钻用于从水果中取出花萼。