As a subject matter expert in the field of food ingredients and composition, I can provide you with a detailed list of the ingredients typically found in a Twix bar. Please note that ingredients can vary by country and manufacturing plant, but the following is a general list for the classic Twix bar:

English Answer:
The classic Twix bar is made up of several layers and components, which include:

1. Biscuit (or cookie in American English) - a crunchy base made from wheat flour, sugar, and sometimes a leavening agent.

2. Caramel - a sweet, sticky layer made from sugar, butter, and possibly condensed milk.

3. Chocolate - a coating made from milk chocolate, which is a combination of cocoa solids, cocoa butter, milk solids, and sugar.

Additionally, Twix bars may contain other minor ingredients and additives such as:
- Salt to enhance flavor.
- Emulsifiers to help blend the ingredients smoothly.
- Flavorings to give the chocolate its distinct taste.
- Preservatives to extend shelf life.

It's important to check the packaging for a complete and specific list of ingredients, as they can vary.

中文回答：
经典的Twix巧克力棒由几个层次和组成部分构成，包括：

1. 饼干（在美国英语中称为饼干） - 由小麦面粉、糖和有时是发酵剂制成的脆皮基底。

2. 焦糖 - 由糖、黄油和可能的炼乳制成的甜而粘稠的层。

3. 巧克力 - 由牛奶巧克力制成的涂层，牛奶巧克力是由可可固体、可可脂、乳固体和糖的组合。

此外，Twix巧克力棒可能还含有其他少量的成分和添加剂，例如：
- 盐 以增强风味。
- 乳化剂 帮助成分平滑混合。
- 调味剂 赋予巧克力独特的味道。
- 防腐剂 延长保质期。

重要的是要检查包装上的成分列表，以获取完整和具体的成分信息，因为它们可能会有所不同。

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TWIX? contains Milk Chocolate 37%, Biscuit 32%, and Caramel 31%. Ingredients: Sugar, Glucose Syrup (Sources Include Wheat), Flour (Sources include Wheat), Milk Solids, Vegetable Fat, Cocoa Butter, Cocoa Mass, Emulsifier (Soy Lecithin), Cocoa Powder, Salt, Natural Flavour (Vanilla Extract).read more >>