achene of Siberian cocklebur

例句：

1. 1. The scientist carefully removedthe achene from the shell.
   科学家小心翼翼地从壳中取出了壳。
2. 2. Theachene is a symbol of theplant's protection from predators.
   壳是植物保护自身免受捕食者攻击的象征。
3. 3. The achene is alsoused as a food source for some animals.
   某些动物也以壳为食。