The Hong kong-zhuhai-macao Bridge is a Bridge and tunnel linking Hong Kong, Zhuhai and Macao in China.
On February 11, 2016, the laser interferometer gravitational-wave observatory (LIGO) announced the observation of gravitational waves generated by the collision of two black holes one billion years ago on September 14, 2015.
In history, all kinds of Bridges are built, including the girder bridge, arch bridge, cable-stayed bridge and suspension bridge, so that across the river, river, and the valley.
The world faced the issue of energy, the environment, health care, health care, education, transportation, food and aging, and so on.
When we talk about intelligent cities, we often talk about how to build intelligent cities, like smart grids or environmental issues.
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