So, processing mixture of vacuum residue and ethylene heavy tar is expected to be a better route for expanding ethylene heavy tar use.

在减压渣油中掺兑乙烯重焦油，有望成为扩大乙烯重焦油利用的一种途径。

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He plans to take a more active role in lawsuits challenging both federal and state governments on issues such as the use of oil extracted from tar sands in Alberta, Canada.

BBC: Nasa's James Hansen retires to pursue climate fight

The use of terms such as low-tar is set to be banned from September 2003 under a European Union directive.

BBC: Women 'conned' by low tar cigarettes