单词：root tuber
root tuber的用法和样例：
例句
- Cassava is a starch crop of which the product harvested is the root tubers.木薯是淀粉作物，收获的产品主要是块根。
- Zinc,found in root vegetables including potatoes,carrots and swedes and also in sesame seeds,is needed for hair growth.在块根类蔬菜如土豆，胡萝卜和瑞典芜菁，另外芝麻中也含有的锌元素，是头发生长所必需的。
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