I finally find a proper power supply adapter.
From many webpage the voltage should be among 6~12 no more than them.
From arduino web page 6~20v
The below example is from one of a tutorial webpage.(Arduino has many varieties and I am not 100% sure whether this is suit to my board )
9V DC 100-500mA
P.S. it seems that as long as connecting the USB cable to a computer, USB cable can supply enough amount of electricity to the Arduino board.
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