Canadian geologists have found evidence of coal char — "remarkably similar to modern coal fly ash" in their own words — in ancient Arctic rocks.

加拿大地质学家们在古老的北极岩石中发现了煤炭的证据，“象极了现代的煤灰”这是他们的原话。

youdao

Mr Dockrell, from Ash, said the Canadian province of Saskatchewan clearly illustrated how the ban was effective in cutting smoking.

BBC: Smoking ban lessons from abroad