医生在她的肾脏发现了一个小结节。
The doctor found a small ___tuber on her kidney.
红薯和山药都是生长在地下的富含淀粉的块茎。
Sweet potatoes and yams are starchy ___tubers that grow underground.
土豆是一种常见的块茎蔬菜。
Potatoes are a common type of ___tuber vegetable.