1
react with sth
描述化学性质时常用一般现在时，主语为不可数名词 potassium，谓语用第三人称单数。
Potassium reacts violently with water.
钾与水剧烈反应。
钾
potassiums — plural of potassium
先理解核心含义，再看它在真实句子里的用法。
钾
A light, soft, silver-white metallic element of the alkali metal group; it oxidizes rapidly in air and reacts violently with water.
Potassium reacts violently with water.
钾与水剧烈反应。
一种柔软、蜡状、银白色的活泼金属,在自然界中从不以游离态存在；原子序数为19、原子量为39.0983的元素。
A soft, waxy, silvery reactive metal that is never found unbound in nature; an element with atomic number 19 and atomic weight of 39.0983.
该元素的一个原子。
An atom of this element.
Bananas are a well-known source of potassium, which helps keep your muscles working properly.
香蕉是众所周知的钾来源，钾有助于肌肉正常运作。
The doctor advised him to eat more foods rich in potassium after his blood test showed a low level.
验血显示他体内钾含量偏低后，医生建议他多吃富含钾的食物。
When potassium reacts with water, it produces hydrogen gas and a lot of heat.
钾与水反应时会产生氢气和大量热量。
描述化学性质时常用一般现在时，主语为不可数名词 potassium，谓语用第三人称单数。
Potassium reacts violently with water.
钾与水剧烈反应。
be high in 表示“富含”，常用于食物、营养成分等语境，后接物质名词。
Bananas are high in potassium.
香蕉富含钾。
a source of 后接物质名词，表示“……的来源”，可用 rich、excellent 等修饰 source。
Sweet potatoes are a good source of potassium.
红薯是钾的良好来源。
表达成分含量时，contain 一般不用于进行时。
This kind of salt contains potassium.
这种盐含钾。
Not this
Bananas are rich in potassiums.
Use this
Bananas are rich in potassium.
potassium 表示化学元素钾，通常作不可数名词，不用复数形式；泛指某物富含钾时用单数。
Not this
He is lack of potassium.
Use this
He lacks potassium.
lack 是动词或名词，不是形容词，不能说 is lack of；表达缺钾可用动词 lacks，或 is lacking in / has a lack of。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
氯化钾
The doctor prescribed potassium chloride to restore her electrolyte balance.
医生开了氯化钾来恢复她的电解质平衡。
缺钾
Muscle weakness can be a sign of potassium deficiency.
肌肉无力可能是缺钾的迹象。
钾含量
The blood test showed normal potassium levels.
血液检查显示钾含量正常。
高钾食物
Bananas are a well-known high-potassium food.
香蕉是众所周知的高钾食物。
高锰酸钾
Potassium permanganate is used to treat some skin conditions.
高锰酸钾用于治疗某些皮肤病。
钾补充剂
He takes a potassium supplement every morning.
他每天早上服用钾补充剂。
钯、钷、钾和钋（出自汤姆·莱勒的歌曲《元素》）
Bananas are rich in potassium, which helps regulate blood pressure.
香蕉富含钾，有助于调节血压。
Use potassiums naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
potassium 可拆成 pot + assium：想象锅（pot）里装着软金属钾，遇水会剧烈反应，牢记钾的符号 K。
语域：mixed 常见场景：chemistry、nutrition、medicine potassium 是化学元素术语，在化学、医学文献中较正式，但日常谈论食物营养时也会用到，语体视语境切换。
No common English word rhymes perfectly with potassium /pəˈtæsiəm/. Calcium /ˈkælsiəm/ is the closest: it shares the stressed vowel /æ/ and the final /siəm/ sound, but adds an /l/, so it is only a near rhyme. Cesium /ˈsiːziəm/ and magnesium /mæɡˈniːziəm/ end in -sium but are pronounced with /ziəm/, not /siəm/. Lithium /ˈlɪθiəm/ and sodium /ˈsoʊdiəm/ share only the unstressed -ium ending. Potato /pəˈteɪtoʊ/ starts like potassium but has a different vowel and ending.
Dictionary facts from ECDICT, WIKTIONARY.