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"Different models have different prices. The duty-free price of this iPhone 11 Pro is over 2,000 yuan cheaper than the official price. This model of Huawei's smartphone is around 300 yuan cheaper after duty free," said Zhang Kaiyang, a salesperson at the duty-free shops, while answering customers' questions.

"Every day I had lots of customers phoning in to ask where their parcels were and I had to go through different carriers' websites to check. E-commerce platforms didn't have the capability to collect tracking information from hundreds of carriers flying around the globe. I had to employ over 10 staff just for customs-related services and the cost of labor was high."

"Electricity demand, resulting from the country's energy transition from coal to electricity for winter heating, came in at 150 billion kilowatt hours last year, accounting for 25 percent of the power use growth," Yu said.

"E-commerce has no time limit for conducting business online. Anyone, regardless of age or gender, can access the online market via the internet," he said.

"During the 20th century, a range of Americans engaged with the Chinese parlor game mahjong not only as an entertaining consumer good but especially as a way to build community," wrote Annelise Heinz, assistant professor of history at the University of Oregon.