Huainan vs Twin

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Huainan is a prefecture-level city with 2,334,000 inhabitants in north-central Anhui province, China. It is named for the Han-era Principality of Huainan. It borders the provincial capital of Hefei to the south, Lu'an to the southwest, Fuyang to the west, Bozhou to the northwest, Bengbu to the northeast and Chuzhou to the east. Huainan is one of the core cities of Hefei Metropolitan Circle and is known for its coal industry and thermal power plants.

Its built-up area is home to 1,938,212 inhabitants in 2010. Its city flower is the Chinese rose (Rosa chinensis) and its city tree is the Old-World Plane Tree (Platanus orientalis). It is also considered to be the hometown and birthplace of tofu.

Source: Wikipedia

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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.

Source: Wikipedia