heptaploid

例句：

1. 1. Heptaploid plants are rare and difficult to cultivate.
   七倍体植物罕见且难以栽培。
2. 2. The heptaploid strain of the plant has been genetically modified for enhanced resistance.
   该植物的七倍体品种已被基因改良以增强抗性。
3. 3. In a study, scientists discovered that some heptaploid species have unique adaptations to their environment.
   在一项研究中，科学家发现一些七倍体物种具有适应其环境的独特的适应性。