There was contact before it was recorded. During the Spring and Autumn Period and the Warring States Period (770 BC-22 BC1year), Liu Che, Emperor Wu of the Han Dynasty (65438 BC +056 July 65438 BC +04 BC-87 March 29 BC), Zhang Qian was ordered by Emperor Wu of the Han Dynasty to go to the Western Regions.
The first recording was made when & gt Zhang Qian went to the Western Regions, and it was discovered that there were bamboo sticks for sale in Qionglai. When asked, they were all shipped from ptomaine, which is India.