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a tuber
tuber 为可数名词，单数形式前需用冠词 a 或 the。
The potato is a tuber, not a root.
马铃薯是块茎，不是根。
块茎
先理解核心含义，再看它在真实句子里的用法。
块茎
a fleshy underground stem or root that stores food and can grow into a new plant
The potato is a tuber, not a root.
马铃薯是块茎，不是根。
植物肉质膨大的地下茎,通常含储存的淀粉,如马铃薯或竹芋。
A fleshy, thickened underground stem of a plant, usually containing stored starch, for example a potato or arrowroot.
冲浪者。
One who tubes.
用于繁殖和储存食物的肉质地下茎或根
a fleshy underground stem or root serving for reproductive and food storage
膨大的根茎。
A thickened rootstock.
A potato is a tuber that stores nutrients underground.
土豆是一种在地下储存养分的块茎。
Many gardeners divide the tubers in spring and plant each piece.
许多园丁在春天把块茎分开，再种下每一块。
The plant's thick tuber helps it survive the dry season.
这种植物肥厚的块茎帮助它度过旱季。
tuber 为可数名词，单数形式前需用冠词 a 或 the。
The potato is a tuber, not a root.
马铃薯是块茎，不是根。
这是 tuber 的复数形式，表示多个块茎。
Some plants store food in their tubers.
有些植物把养分储存在块茎中。
表示“某植物的块茎”时使用 of 结构，注意定冠词 the 的搭配。
The tubers of this plant are edible.
这种植物的块茎可以食用。
Not this
Potato is tuber.
Use this
A potato is a tuber.
tuber 是可数名词，单数前必须加冠词 a，表示“一个块茎”时不能用零冠词。
Not this
The doctor found a tuber in his lung.
Use this
The doctor found a tumor in his lung.
tuber 指植物的块茎或解剖学上的隆起，不指医学上的“肿瘤”或“肿块”；肺部病变应使用 tumor 或 nodule。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
马铃薯块茎
Potato tubers develop underground from the base of the plant.
马铃薯块茎在植物基部的地下发育。
块茎作物
Potatoes are the most important tuber crop in many countries.
马铃薯是许多国家最重要的块茎作物。
可食用块茎
The yam is an edible tuber rich in carbohydrates.
山药是一种富含碳水化合物的可食用块茎。
块茎形成
Cool soil temperatures promote tuber formation in potatoes.
凉爽的土壤温度促进马铃薯的块茎形成。
休眠块茎
Dormant tubers can be stored for several months.
休眠块茎可以储存好几个月。
块茎芽
Each tuber sprout can grow into a new plant.
每个块茎芽都可以长成一株新植物。
Use tuber naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：tuber 的 tu 音近‘土’，土豆这类块茎正长在土里，鼓胀成一块。
语域：formal 常见场景：植物学教材、农业或园艺讨论、学术文章 tuber 是植物学用语，通常用于学术或专业语境，口语中比较少用，日常提到土豆等具体植物时更常说 potato。
植物学中指马铃薯等块茎；医学中亦指结节。
Dictionary facts from ECDICT, WIKTIONARY.