UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Nevada 45-2019013 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 20th Floor, Tower B, Guorui Plaza 1 Ronghua South Road, Technological Development Zone Beijing, People's Republic of China 100176 (Address of principal executive offices) (Zip Code) Title of each class Trading Symbol Name of each exchange on which registered Common Stock, $0.001 par value DTSS NASDAQ Capital Market FORM ...