prototergite

例句：

1. 1. The prototergite is a prominent feature of the plant's structure.
   原毛壳是植物结构的一个显著特征。
2. 2. The prototergite is often used as a reference point for studying the growth patterns of plants.
   原毛壳常被用作研究植物生长模式的参考点。
3. 3. The prototergite plays a crucial role in the development of the plant's reproductive system.
   原毛壳在植物生殖系统的发育中起着至关重要的作用。