5.Russian
5.俄语
Number of speakers: 277 million
使用人数：2.77亿
Mikhail Gorbachev, Boris Yeltsin, and Yakov Smirnoff are among the millions of Russian speakers out there. Sure, we used to think of them as our Commie enemies. Now we think of them as our Commie friends. One of the six languages in the UN, Russian is spoken not only in the Mother Country, but also in Belarus, Kazakhstan, and the U.S. (to name just a few places).
米哈伊尔·戈尔巴乔夫，鲍里斯·叶利钦，雅科夫·斯米诺夫属于数以百万计的俄语人群。当然，我们曾经认为他们是我们的政敌。现在我们认为他们是我们的共产主义朋友。作为联合国六种语言之一，俄语不仅在母国使用，而且在白俄罗斯，哈萨克斯坦，美国都有着广泛的使用。

To say "hello" in Russian, say "Zdravstvuite".
俄语说"你好", 即 "Zdravstvuite"

4.Spanish
4.西班牙语

Number of speakers: 392 million
使用人数：3.92亿
Aside from all of those kids who take it in high school, Spanish is spoken in just about every South American and Central American country, not to mention Spain, Cuba, and the U.S. There is a particular interest in Spanish in the U.S., as many English words are borrowed from the language, including: tornado, bonanza, patio, quesadilla, enchilada, and taco grande supreme.
除了那些孩子在高中上西班牙语课的孩子，西班牙语的使用遍布所有南美洲和中美洲国家，更不用说西班牙，古巴，美国等地。西班牙语可不简单，美国的很多英语单词都借用了其语言，包括：龙卷风，财源滚滚，天井，油炸玉米粉饼，拉达，墨西哥超级玉米饼卷。
To say "hello" in Spanish, say "Hola".
西班牙语说"你好"，即"hola"

3.Hindustani
3.印度斯坦语

Number of speakers: 497 million
使用人数：4.97亿
Hindustani is the primary language of India's crowded population, and it encompasses a huge number of dialects (of which the most commonly spoken is Hindi). While many predict that the population of India will soon surpass that of China, the prominence of English in India prevents Hindustani from surpassing the most popular language in the world. If you're interested in learning a little Hindi, there's a very easy way: rent an Indian movie. The film industry in India is the most prolific in the world, making thousands of action/romance/musicals every year.
印度斯坦语是印度大部分人口的主要语言，它包含了大量的方言（其中最常用的语言为印地语）。虽然许多人预测，印度的人口将超过中国，英语在印度的突出阻碍了印度斯坦语成为世界最为流行的语言。如果你对学习一点印度语感兴趣，有一个很简单的方法：租一个印度电影。印度的电影产业在世界上是最丰富的，每年制定行动/浪漫/音乐剧数以千计。
To say "hello" in Hindustani, say "Namaste"
印度斯坦语说"你好"，即"Namaste"

2.English
2.英语

Number of speakers: 508 million
使用人口：5.08亿
While English doesn't have the most speakers, it is the official language of more countries than any other language. Its speakers hail from all around the world, including New Zealand, the U.S., Australia, England, Zimbabwe, the Caribbean, Hong Kong, South Africa, and Canada. We'd tell you more about English, but you probably feel pretty comfortable with the language already. Let's just move on to the most popular language in the world.
虽然英语不拥有最多的使用人数，但是相比其他任何语言它是多个国家的官方用语。它的使用者遍布世界各地，包括新西兰，美国，澳大利亚，英国，津巴布韦，加勒比海，香港，南非，加拿大。我们会告诉你更多关于英语的事，但你可能感觉与它已经很熟悉了。让我们开始进入世界上最流行的语言。
To say "hello" in English, say "What's up, freak?"
英语说"你好"，即"what's up ,freak ?"

1.Mandarin
1.普通话

Number of speakers: 1 billion+
使用人数：十亿以上
Surprise, surprise, the most widely spoken language on the planet is based in the most populated country on the planet. Beating second-place English by a 2 to 1 ratio, but don't let that lull you into thinking that Mandarin is easy to learn. Speaking Mandarin can be really tough, because each word can be pronounced in four ways (or "tones"), and a beginner will invariably have trouble distinguishing one tone from another. But if over a billion people could do it, so could you. Try saying hello!
惊喜，惊喜，这个星球上最广泛的语言是基于地球上人口最多的国家。以2比1击败排名第二的英国，但不要让它诱导你认为普通话很容易学。讲普通话将会是很困难的，因为每个单词可以有四种发音，一个初学者总是对区别一个音和另一个感到困难。但如果十亿人都能做到，那么你也可以。试着说你好！
To say "hello" in Mandarin, say "Ni hao" ("Hao" is pronounced as one syllable, but the tone requires that you let your voice drop midway, and then raise it again at the end.)
普通话说"你好"，即"你好"（"好"的读音就是一个音节，但语气要求你让你的声音中途下跌，然后再提高到尽头。）

翻译:佳奇 来源：前十网