A worker demonstrates as he threads a needle with hollow noodle in a factory in Gengjiazhuang Village of Gaocheng District in Shijiazhuang, capital of north China's Hebei Province, Nov. 23, 2018. The fine dried noodle produced in Gongcheng, formerly article of tribute to the imperial family, is famous for its thin but hollow strings that is a result of more than ten working procedures. (Xinhua/Chen Qibao)