Anthropologists believe that laughter dates back millions of years -- we were laughing long before we were verbally communicating. Whether you speak Chinese, English or Swahi.

• 人类学家们认为:笑声可以追溯到数百万年以前,在我们口头交流之前,已经会放声大笑。研究者说:不管你说汉语,英语还是斯瓦希里语,全世界人们大笑和微笑的含义都是一样的。