3 6.4.7.1 read the text and answer the questions. 1 why couldn't people build really tall buildings in the past? 2 when could people start building skyscrapers? 3 how did the invention of the elevator change the history of buildings? 4 why did people

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Nature

The number "3" can refer to various things depending on context. Here are a few key meanings:

  • It is the natural number following 2 and preceding 4.
  • In history, for example, the year 3 (III) AD was a normal year starting on Monday in the Julian calendar, with notable events such as Augustus extending his reign and Pauline activities from the early Christian era.
  • In telecommunications, "3" (also known as Three or Hutchison 3G) is a brand name of mobile phone networks and broadband Internet providers operating in multiple countries including the UK, Sweden, Italy, and others. It was officially founded in 2003 and offers 3G, 4G, and 5G services.
  • In entertainment, "3%" is a TV series about a dystopian future with a competitive selection process for joining a privileged society.
  • In Sweden, "3 Sverige" (Hi3G Access AB) is a major mobile operator owned by CK Hutchison Holdings and Investor AB, serving over 2 million customers with 3G and 4G networks.

If you had a specific context or meaning in mind for "3," please let me know to provide more targeted information.