Question: echo dot 2是何时问世的
Answer: 2016-10-20; 10 20 2016; 2016-10-20; 10/20/2016; 20-10-2016; 20 10 2016; 2016 october, 20; 10-20-2016; 20 10月 2016; 2016 10月 20; 20/10/2016; 2016 10 20