名词
中文翻译：球茎
同义词：
['tuberous root', 'rhizome', 'bulb']
例句：
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1. The potato is a tuber that grows underground.
土豆是一种生长在地下的块茎。
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2. The onion has a bulb at the base of its stem.
洋葱的茎底部有一个块茎。
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3. The carrot is a tuberous root that can be eaten raw or cooked.
胡萝卜是一种可以生吃或煮熟的块状根。