root tuber的用法和樣例：
例句
- Cassava is a starch crop of which the product harvested is the root tubers.
木薯是淀粉作物，收獲的產(chǎn)品主要是塊根。 - Zinc,found in root vegetables including potatoes,carrots and swedes and also in sesame seeds,is needed for hair growth.
在塊根類(lèi)蔬菜如土豆，胡蘿卜和瑞典蕪菁，另外芝麻中也含有的鋅元素，是頭發(fā)生長(cháng)所必需的。
