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a piece of marzipan
marzipan 是不可数名词，表示“一块”时用 a piece of。
She ate a piece of marzipan.
她吃了一块杏仁蛋白软糖。
杏仁蛋白软糖；杏仁膏
marzipans — plural of marzipan
先理解核心含义，再看它在真实句子里的用法。
杏仁蛋白软糖；杏仁膏
a sweet confection made from almond paste and egg whites
She ate a piece of marzipan.
她吃了一块杏仁蛋白软糖。
用杏仁酱、糖和蛋清作粘合剂制成的糖果。
A confection made from a paste of almonds, sugar and egg white as a binder.
用其他坚果(如花生或榛子)制成的类似糖果。
A similar confection made using another nut, such as peanut or hazelnut.
一块这种糖果。
A piece of such a confection.
My grandmother makes marzipan fruits every Christmas and coats them with chocolate.
我奶奶每年圣诞节都会做杏仁蛋白软糖水果糖，再给它们裹上巧克力。
I bought some marzipan from the candy shop because I love its sweet almond taste.
我从糖果店买了一些杏仁蛋白软糖，因为我喜欢它甜甜的杏仁味。
This cake is topped with a thin layer of marzipan, so it looks smooth and shiny.
这个蛋糕表面覆盖着一层薄薄的杏仁蛋白软糖，所以看起来光滑又有光泽。
marzipan 是不可数名词，表示“一块”时用 a piece of。
She ate a piece of marzipan.
她吃了一块杏仁蛋白软糖。
marzipan 可直接修饰名词作定语，如 marzipan sweets（杏仁蛋白软糖）。
It's a marzipan cake.
这是一个杏仁蛋白软糖蛋糕。
描述蛋糕等表面有一层杏仁膏时，常用 be covered with marzipan。
The cake was covered with marzipan.
蛋糕表面覆盖着一层杏仁膏。
Not this
I bought a marzipan.
Use this
I bought some marzipan.
marzipan 作“杏仁膏、杏仁蛋白软糖”这种原料/食物讲时是不可数名词，不能用 a 来计数；表示“一些”用 some，或说 a piece of marzipan。
Not this
The cake is made by marzipan.
Use this
The cake is made with marzipan.
被动语态里 by 引出的是动作执行者，不能引出制作材料；表示“用某材料/配料制作”应用 with（或 of/from）。这是受汉语“由……制成”影响导致的介词误用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
杏仁蛋白软糖水果蛋糕
We had a marzipan fruitcake at Christmas.
圣诞节我们吃了杏仁蛋白软糖水果蛋糕。
杏仁膏糖霜
She covered the birthday cake with marzipan icing.
她用杏仁膏糖霜覆盖了生日蛋糕。
杏仁膏糖果
The shop sells handmade marzipan sweets.
这家店出售手工制作的杏仁膏糖果。
杏仁膏馅
These chocolates have a soft marzipan filling.
这些巧克力有柔软的杏仁膏馅。
制作杏仁膏
We need ground almonds and sugar to make marzipan.
我们需要杏仁粉和糖来制作杏仁膏。
中间管理层
The new CEO plans to cut the marzipan layer to reduce costs.
新任首席执行官计划削减中间管理层以降低成本。
Use marzipans naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆：'妈子'（marzi）在平底锅（pan）里做杏仁软糖。
语域：neutral 常见场景：cooking、baking、confectionery marzipan 是中性常用词，不区分正式或非正式；多用于烹饪、烘焙及甜品制作场景，也常见于食谱和食品标签中。
指不同种类或多块这种食品时可用复数 marzipans。
Dictionary facts from ECDICT, WIKTIONARY.