As a food science expert with a focus on dietary trends and food production, I can provide you with an informed answer to your question about veganism and dark chocolate.

English Answer:
Not all dark chocolate is necessarily vegan. While dark chocolate typically contains cocoa solids, sugar, and sometimes vanilla, the presence of certain additives can make it non-vegan. Common non-vegan ingredients in dark chocolate include milk solids or milk powder, which are derived from dairy. Additionally, some dark chocolates may contain emulsifiers like lecithin, which can be sourced from both plant and animal sources. It's important to check the label for a product that is specifically marked as vegan to ensure it doesn't contain any animal-derived ingredients.

中文回答：
并不是所有的黑巧克力都必然是素食的。虽然黑巧克力通常包含可可固体、糖，有时还有香草，但某些添加剂的存在可能使其不符合素食标准。黑巧克力中常见的非素食成分包括来自乳制品的牛奶固体或奶粉。此外，一些黑巧克力可能含有乳化剂如卵磷脂，它既可以来自植物也可以来自动物。重要的是要检查标签，确保产品特别标明为素食，以确保它不包含任何来自动物的成分。

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Also, be sure to check the ingredients, as some brands' dark-chocolate bars still contain dairy products. ... And make sure you avoid ingredients that are derived from milk, such as whey, casein, milk, milk fat, and milk solids.read more >>