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An accurate survey depends on the pollster's skill in selecting a random sample and finding the right mix of respondents to match turnout on Election Day.
An employee works in a fishery feed warehouse in Haikou, South China's Hainan province, on Feb 18, 2020. [Photo/Xinhua]
An electric vehicle is on display at the booth of Beijing Automotive Group during the Beijing Auto Show on Apr 26, 2016. [Photo/Agencies]
An Israeli biomedical company is working on a mini nerve stimulation device that could be implanted into the human body to reduce the workload of the left ventricle in the heart, so that its efficiency could be improved and help to reduce heart failure as a result.
An advertisement for the First China International Import Expo is seen on the top of a Metro train in Shanghai, August 30, 2018. [Photo/IC]
来源：资阳报