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Another viewer commented that "People that make others laugh are not necessarily happy themselves".

Another nine subway lines currently under construction will also be equipped with 5G networks, the operator said. More than 6,700 5G base stations have been installed in the city so far.

Any level below 4 mcg per cubic m is considered safe, according to petrochemical industry standards, the district's environmental protection bureau said.

Another change relates to speed. In 40 years, the operational speed of Chinese railways has surged from less than 40 km per hour to up to 350 km per hour.

Apart from economic development, what progress in other fields have you witnessed in China in the past 40 years?