Dr Chongyi Feng, visiting China for a research trip, has twice been prevented from boarding flights to return to Australia.
Concern mounts for Sydney academic stopped from leaving China
Thủ tướng Trung Quốc Lý Khắc Cường và ông Malcolm Turnbull tại Sydney Source: AAP
Colleagues of a Sydney academic say he has been stopped from leaving China because he refused to undergo a lie-detector test for the country's secret police.
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