irregular calyx

例句：

1. 1. The irregular calyx is a distinctive feature of some flowers.
   不规则花萼是某些花朵的独特特征。
2. 2.The plant's irregular calyx helps it to survive in harsh environments.
   这种植物的不规则花萼有助于它在恶劣环境中生存。
3. 3.The scientist observed the irregular calyx of the flower and noted its unique structure.
   这位科学家观察了这种花的不规则花萼，并注意到了它的特殊结构。