语言学家对俚语没有简单明确的定义，但他们一致认为，俚语是一种不断变化的语言现象，存在于世界各地的亚文化中。俚语是一种非正式的词汇(单词、短语和语言用法)，常见于口头交谈，但在正式写作中避免使用。因为俚语并不总是从字面意义上讲得通，所以您需要熟悉每个俚语的意思和用法。英语俚语是日常英语的重要组成部分。
儒琴今日英语俚语 （English Slang of the Day)
asphalt jungle
noun
英文解释
concrete jungle；a big city or a specified part of a big city；an ugly grey area of a city where people live in closely crowded apartment buildings and there is little space and no trees or grass；the paved landscape of the city; the city viewed as a savage place；the crowded city, esp. regarded as a place of predatory behavior in a struggle for survival
中文解释
asphalt jungle（字面意思：沥青丛林）， 如同 concrete jungle （字面意思：水泥丛林），引申描述大城市，尤其大城市中丑陋的灰色地带，人们住在拥挤不堪的公寓楼里，到处是钢筋水泥，几乎没有太多的空间，没有树木或草地; 被视为野蛮之地的城市; 拥挤的城市，尤指被视为食肉动物为生存而斗争的地方。
原文举例
After 10 years living in that asphalt jungle, I’m looking forward to being in a place with a bit of grass and friendly neighbors.
在钢筋水泥拥挤不堪的城市（沥青丛林）里住了10年之后，我期待着能住在一个有一点草和友好邻居的地方。
He said that he lives in the Asphalt Jungle, otherwise known as the New York City. I was intrigued by his reference to New York City. I heard people talk about the Big Apple, but not Asphalt Jungle.
他说他住在拥挤不堪丑陋城市里，也就是纽约。我对他提到的纽约市很感兴趣。我听到人们谈论大苹果（纽约的别名），但没有把纽约说成拥挤不堪丑陋的城市（沥青丛林）。
To me concrete/asphalt jungle, is just a common way to describe the appearance of any modern city. The literal translation of this phrase functions in my language too, although I believe that it was originated in one of the English speaking.
对我来说，混凝土/沥青丛林只是描述任何现代城市外观的一种常见方式。这个短语的字面翻译在我的语言中也有作用，尽管我认为它起源于一个英语口语。
