Dalian has regulated the cigarette circulation channels earlier and made efforts to establish normative cigarette market operation mechanism.

大连市较早的规范了卷烟流通渠道，努力建立规范的卷烟市场运行机制。

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He also noted in a patent filing that the process allowed the blue-screen procedure to cope with glassware, cigarette smoke, blowing hair and motion blur which had all caused problems for earlier efforts.

BBC: Blue and green-screen effects pioneer Petro Vlahos dies