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The main gustatory difference between a spring roll and its egg cousin is that spring rolls have thin, often translucent flour wrappers and usually aren't fried, while egg rolls have thicker, deep-fried wrappings. Also, spring rolls in America are often filled with carrots and bamboo, while egg rolls are more likely to be filled with meat and bean shoots. Oh, and one other difference: Spring rolls are Chinese; egg rolls probably aren't.
In fact, Chinese cuisine in America is so vastly different from Chinese cuisine in China that many American Chinese restaurants advertise, beneath their English names, the words "Westernized Food" in Chinese.

http://mentalfloss.com/article/16080/whats-difference-egg-ro...

The term egg roll is commonly used in English speaking countries to refer to variations of fried foods involving filling wrapped in flat bread. The dish is considered a subtype of the spring roll in mainland China, with the Chinese term meaning egg roll referring to the biscuit roll instead.[1] Egg rolls are considered distinct from spring rolls outside of mainland China.
https://en.wikipedia.org/wiki/Egg_roll