"I purchase luxury bags or perfume in the Sanya duty free shop because I get the opportunity to fly there twice a year for business," said Chen Ping, a sales in Beijing.

The XJ-A130 is small enough to slip into a laptop bag or briefcase, making it easier to travel with than a portable projector in a traditional form factor.

By comparing with wrapped yarn fabric and doubling twist yarn fabric, the conclusion that the application of differential twist wrapped yarn fabric to worsted spinning is practicable was acquired.