PROF. ZHENG YANGWEN:'By the 1820s, opium addiction became visible socially.' Which means opium dens on the street, people dying off, dozing off on the street, it's becoming a social problem.

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David Hughes, CEO of project promoter East West Railway Co, tells Andrew Grantham.

Direct services into the UK resumed on February 10 after work at Amsterdam Centraal made pre-boarding checks possible.